My son, JR, turned 5 on Monday. My birthday was on Sunday, so every year he's my birthday present and I try to make sure that my birthday is about his birthday. One of the toys I got us, yes us, not him, was the car shown below.
It's totally awesome. It comes with a marker and you draw a line on paper and the car will follow the line as its path. I'm going to try to put the car on a plan sheet and see if the car will follow the path or get confused with all of the lines, just like contractors do. This will be the true test of CAD vs BIM through the eyes of a 5 year old.