Draw a Scientist
The Draw a Scientist test is a classic, and one that I think about a lot (see my communications talk). Kids tend to draw a very specific type when asked to draw a scientist, and I bet you can guess what that looks like. If not, see the paper linked above. I hope that teaching science as an oddball 25-year-old shifts what my kids think of as a scientist. In fact, one of the kids in class explained to another kid "That a scientist is like Victoria the Teacher. She does science for little kids! And other science too."
And then one of the 6 year olds drew this in her science notebook from summer camp. Perfection.
A sampling of other beauties: [WRG]