I did that last night when I had my first free hours in a long time. Felt terrible to waste it. In school we had mandatory free writing for 10 minutes where we had to write something down on the page. Is free drawing a thing? Drawing warm-up? *-) It could help. :)
What’s to be worried about? The worst that could happen is that you make a total fool of yourself, and somehow it gets around to all your friends, who think it’s so horrible that they abandon you to the wilds to live on your own among savage animals. No sweat.
So, im currently at six flags, (been here since 11am), went to one of the caricature booths and jokingly ask how much would it cost for me to do some drawings. They actually let me draw for a few seconds, unfortunately my gf isn't as obsessed with drawing and coloring as i am and i couldn't get her to sit still. My point, six flags employees are pretty cool for letting me do it at all. This was about 25-30 seconds.