didn't we?

An elephant walking through the jungle came to a ravine that was spanned by a rather flimsy rope bridge. He looked at it and decided it was probably just stong enough to bear his weight. As he took his first step onto it a flea jumped into his ear. Gingerly the elephant made his way across. Once at the other side, the flea jumped out and boasted...

"We sure shook that bridge, didn't we!"