Back in 2003, the McDonald's at East Alton, Illinois had a strangely-worded sign that just begged to be pranked. So the folks at Phone Losers of America did just that:

I don’t want to use any of the ideas that defame the quality of McDonald’s food or falsely advertise their products. My intent is mostly to amuse people, not piss them off. I finally decide to pick Mithrandir_t00’s suggestion of “Our team is endowed to guarantee your satisfaction” but I change his wording slightly to read,
“Our team is well-endowed to guarantee your pleasure!” Even if this is false advertising, I don’t think the employees are going to say, “Hey, that’s not true because our weeners aren’t that big!”

Link - via Miss Cellania