I accidently killed a hamster when I was little. Her name was Goldy *sob* and she used to run around in one of those little plastic ball things. Well, one day I thought I would be really nice to Goldy and clean out her ball.....with a Lysol solution.... Apparently those little holes don't provide enough ventilation to air out the Lysol.
I felt terrible, especially considering Goldy had survived getting stuck in my mom's car engine and several other mishaps.