I have fun taking out of town guests under the bridge and have them experience the boat getting shoved around by the current (while maintaining steerage way, of course.) They seem to like it, too.
OTOH, I have experienced what Grumpy mentioned, and it wasn't loonies either. It was a big fishboat and I swear they deliberately created as much wake as they could. I could not slow down fast enough and we were thrown around violently. Easily could have broken something or somebody. I am very cautious around other boats in the Pass now.
Warren