People shoes--left under the trampoline during a rainstorm
DVDs/CDs/Computer disks which get scratched within 15 seconds of unwrapping
Money left by the tooth fairy
Dollar store purchases which prove defective the minute they are removed from dollar store premises
Anything that comes home in a party "goody bag"
The microscopic light saber that came with the Lego Darth Vader
Items that need batteries or recharging
Loose change and half-eaten lollipops
Crayola marker caps
Did I forget anything?