Command line zalgo.
pip install zalgotext
$ zalgo hail satan
h̸͕̰͓̺ͭ̔ͭͭͭͭ͐ͭ̎ͭ́ͭͭ̔ͭͮͭ̋ͭͭ͏̴̨̡̱̤̞̥̺̜ͭͭͭͭ̿ͭ̆ͭ̔ͭͭ̏ͭͪͭ̓ͭͭͭͭ͑ͭͭ͑ͭͭͭ͗ͭͭ͆ͭͭ̂ͭͭ͐ͭ̕͠͝͠a̶̶̫̲͎ͭͭͦͭͭͭͭ̉ͭ̆ͭͭͤͭi̞ͭͭ͒ͭ̋ͭ̇ͭ̾ͭ҉̵̣͕̩͚̯̟̱ͭ̾ͭͯͭͭͭͭͭͭͭͨͭͭͭͭ͘l̮ͭͭ͛ͭ͗ͭͭ̓ͭͣͭ̒ͭ͞ ̷̸̡̮̺͖̖̜̜̻̺͎̝̼ͭ̃ͭ̃ͭͭͭ̌ͭͭͭ̽ͭͭͥͭ͛ͭͭͭͭͭͭ̂ͭͭͭͭ̈ͭ́ͭ̓ͭͭ̔ͭ̋ͭͭͭͭͭͭͭͭ̌ͭ̚̕͢͠ͅ҉ͭsͭ҉̡̺͚ͭ͛ͭ̍ͭͭͭͭͭ̕a͎̩̯̪̝͇̳̬͎̙͎̯ͭ̾ͭͭͭ͂ͭͭͭͭͭͭͭͭͩͭ̌ͭͭͭͭ̄ͭ̾ͭt̹ͭͧͭͭͬͭaͭ̔ͭ҈̶͕̙̣͈ͭͭͭͭ̏ͭͭͭͭͭͤͭͮͭ͜͞nͭ҉̵̸͕̣͉̟̥ͭͭ͌ͭͭͭͭ̊ͭͭͭ̄ͭͭͭͭ̆ͭ̇ͭ́ͭ͢͡҉̡̢̢̛̥̺͚͓͔͚̫͚̦̦̺ͭͭ͊ͭͭͭ̀ͭ͌ͭͭͭͭͧͭͭͭ̊ͭͭ̉ͭ͑ͭ͛ͭͭͭͭͭ̓ͭͭ
Zalgo can also copy straight to the clipboard:
$ zalgo cthulu lives --copy
č̻̻t̻̩̻̻͍̻̻̭̻̻̄̄̎h̨̻̻̻̻̻̙̻̻̻̣̻͓̻̻̻̻̻̻͔̻̝̻̅ͣ̀̂̆̾ͫ̀ͅͅu̻̻ͦl̻̻̭̻̀u̻҈̻͚̻̻̻̭̻̳̻̻̦̻̻̄́͠͞͏̨̛̻̻̻̻̻̻̻̻̻̘̻̻̻̲̻̖̻̻͕̻̻̻̻͚̻̻̜̻̻͐̀̊͛ͬͧ́̑̆͂ͩ̇̚͜ ̻̻̆͏̻̱̻̫̻̟̻̻͐͏̷̷̷̡̢̧̡̻̮̻̻̻̟̻̻̻̻̻̻̻̻̗̻̞̻̻̻̺̻̭̻̻̻̻̙̻̤̻̪̻̻̻̻̻̻̻̻̦̻̠̻̻̻͖̻̉̐̀̎ͪ̇̃̀ͧ͗ͥͮ̕͘͘͡l̵̨̻̲̻̻̤̻̻̻̻̻̻̻̮̻̻͍̻͈̻̻̮̻̻̭̻͑͋̌ͮ͆ͧ͜ͅ͏̻̻̻̻͖̻̻͉̻̻̻ͤͪ̾ͫ̑̚i̻̬̻̪̻҉̶̸̡̻̻̻̻̻̻̻̝̻̻̻̻̻̻̱̻̻̞̻̗̻̻̱̻̻̩̻̤̻̻̻̻̮̻́̎ͫ͋ͣ̓̿ͪ̄̿̓͑̚͢v̻̻̻̻̻ͥ̈ͫͨ҈̧̻̻̯̻̫̻̻̻̞̻̻̻͎̻̯̻̻̻̻̻̻͓̻͍̻̻̻̻̠̻̤̻̻ͮ͒ͫ̇͋̆̓ͪ̔̊̚͘ͅe̻͔̻̜̻͈̻͉̻s̴̢̻̻̻̻̻̻̞̻̳̻̻̻̻̱̻͖̻̻̝̻̤̻̻̣̻̻̻̪̻̻̻̥̻̻̈́̊ͬ̆ͩ̓ͪ̃̄̓ͅ͏̧̻͕̻̩̻̻̻̯̻̻̻̺̻͉̻̻̻̦̻̻̤̻̻͓̻̺̻̠̻͕̊̂̔̂̑̐̽
And that's all it does!
Rich Jones 2015. Based on @mjgiarlo's pyzalgo.