a few that haven't been listed yet:
rocks
bricks
an axe
metal spatula
paint can opener
I like the rock one the best. When I'm outside with no tools or anything around and I don't want to f up my pocket knife . . I look around, thinking "ok, I need a rock with a nice little edge on it . . where are you, where are you . . a ha!". It's an empowering feeling.
Wedding ring while on the finger. WIFE LOVES THAT!!!
OMG - in the helicpoter video - has the cameraman never heard of a tripod? I needed 5 hits of dramamine to finish watching that!
Paintball gun grip handle
Another bottle
Teeth
550 cord
AR-15 front site post
AR-15 Charging handle
MRAP Foot Step
and old reliable BCGs ear piece