When I was a kid, I lived in Salem, Oregon. Salem was recently in the news for making joke signs a reality in Bush's Pasture Park where an "Angry Owl" has been attacking runners. This fits in perfectly with my Caution sign tee-shirt theme. So I designed a shirt.
Now you can wear the "Angry Owls" sign on a limited-edition silk-screened 2-sided t-shirt from Teespring.