The glitch you love most?

[Sick boy]

I don't like glitches but the glitch I had the most fun with was sky walking in CS 1.6 at De_dust

 

[Dr. Wily III]

Duplicating in Silver/Gold/Crystal, even though I am always scared of that one because you must reset the Game while saving.. but it works almost everytime.

And in Half-Life 2 Deathmatch on the map dm_runoff there are 2 save spots for the missles besides the building.