Give a kid the Think Geek catalog and they go wild...
Today I got home and found Cameron in the garage building his own Annoy-a-tron.
He actually had a buzzer that he attached to a piece of 2x4 and then taped a battery to the thing, screwed on a handle and constructed a trigger our of aluminum foil. Then of course it got the "ray-gun silver look" duct tape treatment. Nice.
Did I mention it was loud/annoying as hell? Oh yes, mission accomplished for sure.