As the saying (and if it isn't one, it should be) goes, I can't draw, but I can doodle. Further, I used to be able to doodle much better than I can now.
Here's one I did about 20 years ago, while I was working at the now-defunct Graphitti comic book store in Westwood. I drew it on the back of a convention flyer.
Not quite in the same league as JFK doodling the word "Vietnam" over and over again (as shown in a recent LA Times article), but it shows what was on my mind my senior year of college.