IDK, but it's crawling up your leg right now :)
don't you hate it when that happens?
When I was a kid, the old answer (to the joke told orally, so red/read makes a pun) was "a newspaper". But I guess that answer will someday get the response, "what's a newspaper?" when the joke is told to a young person in the future, who has known only electronic media!<br />
On the other hand, the "second" answer when i was a kid was "a sunburned zebra." I recently have heard " a sunburned panda." See? We're getting more multicultural! :)