diff --git a/NAMESPACE b/NAMESPACE
index 8d6210b6d..bc7c5c94d 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,5 +1,6 @@
 # Generated by roxygen2: do not edit by hand
 
+S3method(anti_join,data.table)
 S3method(anti_join,dtplyr_step)
 S3method(arrange,dtplyr_step)
 S3method(as.data.frame,dtplyr_step)
@@ -9,32 +10,48 @@ S3method(as_tibble,dtplyr_step)
 S3method(auto_copy,dtplyr_step)
 S3method(collect,dtplyr_step)
 S3method(dim,dtplyr_step)
+S3method(distinct,data.table)
 S3method(distinct,dtplyr_step)
+S3method(do,data.table)
 S3method(do,dtplyr_step)
+S3method(full_join,data.table)
 S3method(full_join,dtplyr_step)
+S3method(group_by,data.table)
 S3method(group_by,dtplyr_step)
 S3method(group_size,dtplyr_step)
 S3method(groups,dtplyr_step)
 S3method(head,dtplyr_step)
+S3method(inner_join,data.table)
 S3method(inner_join,dtplyr_step)
+S3method(left_join,data.table)
 S3method(left_join,dtplyr_step)
+S3method(mutate,data.table)
 S3method(mutate,dtplyr_step)
 S3method(n_groups,dtplyr_step)
 S3method(print,dtplyr_step)
 S3method(pull,dtplyr_step)
+S3method(rename,data.table)
 S3method(rename,dtplyr_step)
+S3method(right_join,data.table)
 S3method(right_join,dtplyr_step)
 S3method(same_src,dtplyr_step)
+S3method(sample_frac,data.table)
 S3method(sample_frac,dtplyr_step)
+S3method(sample_n,data.table)
 S3method(sample_n,dtplyr_step)
+S3method(select,data.table)
 S3method(select,dtplyr_step)
+S3method(semi_join,data.table)
 S3method(semi_join,dtplyr_step)
 S3method(show_query,dtplyr_step)
+S3method(slice,data.table)
 S3method(slice,dtplyr_step)
+S3method(summarise,data.table)
 S3method(summarise,dtplyr_step)
 S3method(tail,dtplyr_step)
 S3method(tbl_vars,dtplyr_step)
 S3method(tbl_vars,foo)
+S3method(transmute,data.table)
 S3method(transmute,dtplyr_step)
 S3method(ungroup,dtplyr_step)
 S3method(union_all,dtplyr_step)
diff --git a/NEWS.md b/NEWS.md
index b581754f1..b398aae5d 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -12,6 +12,9 @@
     extremely inefficient so offered little of data.table's impressive speed,
     and was used by very few people.
 
+*   dtplyr provides methods for data.tables that warning you that they use the
+    data frame implementation and you should use `lazy_dt()` (#77)
+
 * Joins now pass `...` on to data table's merge method (#41).
 
 * Convert from lazyeval to tidy eval (@christophsax).
diff --git a/R/eager.R b/R/eager.R
new file mode 100644
index 000000000..9c4ff6f66
--- /dev/null
+++ b/R/eager.R
@@ -0,0 +1,133 @@
+# nocov begin
+
+warn_data_frame_method <- function() {
+  warn(strwrap(paste0(
+    "You are using a dplyr method on a raw data.table, which will call the ",
+    "data frame implementation, and is likely to be inefficient. \n\n",
+    "To suppress this message, either generate a data.table translation ",
+    "with `lazy_dt()` or convert to a data frame or tibble with ", "
+    `as.data.frame()`/`as_tibble()`."
+  )))
+}
+
+# Single table ------------------------------------------------------------
+
+#' @export
+distinct.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+do.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+# exported onLoad
+filter.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+group_by.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+mutate.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+rename.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+sample_frac.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+sample_n.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+summarise.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+select.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+slice.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+summarise.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+
+#' @export
+transmute.data.table <- function(.data, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+
+# Two-table ---------------------------------------------------------------
+
+#' @export
+left_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+right_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+inner_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+full_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+semi_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+#' @export
+anti_join.data.table <- function(x, y, ...) {
+  warn_data_frame_method()
+  NextMethod()
+}
+
+# nocov end
diff --git a/R/zzz.R b/R/zzz.R
index ea1fabf6f..fcb44886b 100644
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -1,5 +1,7 @@
 # nocov start
 .onLoad <- function(...) {
+  register_s3_method("dplyr", "filter", "data.table")
+
   register_s3_method("dplyr", "filter", "dtplyr_step")
   register_s3_method("dplyr", "intersect", "dtplyr_step")
   register_s3_method("dplyr", "setdiff", "dtplyr_step")