I found this on top of a climb

[Todd Gordon]

I thought it was strange too......if you unscrew the lid and take a drink, it pulled the pin and boooommmmm....

[sarahjane]

That's comedy! And probably piss.

[Quick Draw McGraw]

the sticker on it is a sticker cavers use to identify different groups of themselfs

[skully]

Cavers have to have a sense of humor, otherwise WHY do all that crawlin' around?

[Quick Draw McGraw]

i have no clue, im still trying to find answer why i do it

[Dublin_Aidan]

Wasnt Michael Reardon known for planting womens knickers and the likes on top of climbs!?. I think its a kind of twisted humor thing as if designed to get the hapless climber who might think they are one of the few to send a climb to find something as random as this!.