Did you read the Da Vinci Code? Remember the ambigrams (text art that looks the same when read upside down)? Here are two very cool ambigram websites: Link and Link
While we’re at it, checkout another type of word play:
Tarzan raised Desi Arnaz’ rat.
Damn! I, Agassi, miss again! Mad!
Did I do, O God, did I as I said I’d do? Good, I did!
"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat."