The only weird glitch I've seen is when I fell through the map...and then my game crashed shortly afterward.

Me having stretchy limbs reminiscent that of nope.avi

This is my absolute fav glitch in New Vegas. Might work in Fallout 3 also.

Shoot a companion, or any essential creature in the head, rendering them 'unconscious'.

Then, wait til they start to resurrect, and go into bullet-time or vats, and get another killshot on them before they resume their standing position. The results are hilarious, and rather unstable. Sometimes they end up looking like they just got whacked by a giant from Skyrim. Essentially, they become satellites.

Try it out!!

I was stunned when I walked into the camp golf resort house and I can see that everywhere missing textures and the walls are transparent. I use NMC`s texture pack, and as it turned out, the error was committed by a misconfiguration ENB.

the weirdest thing so far is that i saw a powder ganger body glitching in the ground and waving its hand about yesterday