Batman's ultimate authority is so overwhelming that no one would have a doubt about his word of truth. A friend of mine gave me the empty template pic of that old Batman comic and I played around a bit abusing Batman's persuasive power. Unfortunately there's nothing you couldn't add to the speech bubble, the words could even be turned around! Aware of that fatal flaw I've let my senses pan my mind and that was what - how surprisingly - came to me first: SKA BIKE
If you like them, use them.