This has got to be the smallest mob crusher in Minecraft. It brings skeletons, creepers and blaze down to 1/2 a heart so you can kill them with one punch. Zombies will require an additional 4 block drop to be one punch kills.
Props to BugCraft38 who showed me this design.
If you're looking for info on how to create a mob trap with which to use this crusher, here are a couple of links you might want to check out:
NOTE: I really love getting your comments and questions but please keep them clean and respectful and consider checking the FAQ on the front page of my channel before you embarrass yourself by asking a question that I've already answered many times before. Thanks!
This video contains footage from the video game Minecraft.
All other content in this video is original and was created by myself.