My last and perhaps one of my worst as well - throwing away crappy old pot brownies into my studio trash can, being too lazy and stupid to empty it out for a week. Subsequently the dog gets into the trash and eats them all. I get a call at work (in the middle of lunch rush) that the dog looks like death and can't stand up and the kids are hysterical. "There are a bunch of crumbs around your garbage can FC, do you know what's going on?" ...and then the facts turn me pale...
The poor wife had to take the dog to the vet and got the mean, nasty, uptight guilt-tripping vet. Pooch was fine, just needed rest and water.
This was all a week after one of the kids foung some drying bubble hash of mine. Teh hreb was not welcome at castle FC for a looooooong time.