What is it with vents?

A little while ago, I got a total kick out of Elena Manwaring's post featuring her little Kate filling their vent with cereal. I have decided that Gordon and Kate must be kindred spirits, and yesterday I got more proof when I discovered some treasures in the vent in the boys' room:





Here is everything I collected from inside the vent. The funniest thing is that the baby bulb syringe is not ours!