Los Angeles Times' Your Scene gallery user pablo uploaded this photo of a "lost in translation" sign (yes, made popular by Engrish.com) warning us that playing and jumping are dangerous. A quick Googlin' pinpoints the sign near Powell St. and Sacramento St. in San Francisco's Chinatown.
Whoever those two people are, they look like they had fun playing and jumping around before taking the photo. Check out more user-submitted Weird Warnings gallery over at the LA Times: http://yourscene.latimes.com/mycapture/photos/Album.aspx?EventID=503684&CategoryID=30888
http://www.flickr.com/photos/tranquilo/357730257/in/set-72157594480013608/