Here's my first contribution to the thread. I've done the glitchiest NES Metroid run you have ever seen.
Plays with Metroid (U)
I did this by plugging in some cheat codes (the exact ones used are in the movie's description, you'll need to input them yourself to view the movie). These codes let me moonjump (even through ceilings), roll through walls, and burrow through floors as a morph ball. (The infinite life and missiles comes from the password I used, NARPASSWORD.) I've tried to show off some funny stuff with the Metroid engine that should make you laugh.
This also shows off the single most suspenseful escape sequence in ANY Metroid game (at least to make)