Things to Do with "paint"
Put a bow that looks so much like a tank ( with spray paint of course ) and attach it to your car and go off-road with it in a popular off-road track. Make sure that 4wd is on and that it is a 4wd because you don't want to get bogged in front of a giant croud when you look like a card-board tank. Use your phone/tablet to make authentic tank noises and see how many people look at you weirdly.
Grate a carrot and put it in a bucket. Then paint a face on the bucket, so that it looks like it has orange brains pocking out of the top and put in in you garden.
Take a large cardboard box. Paint it to resemble a car. Take it through a drive-through.