Those traps are crazy. I remember when we first moved in to the house my family lives in now, we had a big rat problem (old house, lots of room above the ceiling, etc.). We got a trap or two, caught some of the buggers. Unfortunately, we caught one of them just before it rained really heavily and our backyard flooded - meaning by the time we could GET to the trap, we had one very dead, bloated rat. I was simultanously sad, grossed out, and fascinated. I should probably not be released upon the public. *foams at mouth*
Edit: ... I have named the rat Norman.
There is no hope for me.