I have memorized my calling card number, but one could put it on waterproof paper as mentioned here. Or just include a non-regular use credit card which should be able to handle both the gatorade and the call. I've found payphones where $3 wouldn't even get me past the first minute. <img src="/images/graemlins/mad.gif" alt="" />

Some vending machines can take the gold dollars or Susan Bs, but that's pretty hit-or-miss. A quarter could be used as a sinker if you knew a sling knot that would hold it in line. I've also seen them used as last ditch screwdrivers and prybars. With a WHOLE LOT of grinding, you might get a usable edge on one too (maybe pre-edge one as an emergency knife?) Of course, defacing money is illegal - and I wouldn't want to hand a sharp coin to someone.... <img src="/images/graemlins/smile.gif" alt="" />

There's probably any number of other uses - I just hadn't ever seen that in any PSK, so I wondered....