I've reached into gaurdrails before and pulled out hornets nests...
I've reached into rocks and pulled out some nasty looking spiders...
I've cached down south and came out with some very unpleasant hitchhikers...

Does that mean we should ban all gaurdrail, rockwall, and southern caches???

Common sense is very usefull and it doesn't weigh very much, so you should always carry it with you...