One pair of mine squeak when wet, but the others don't

I don't mind it, but would probably feel differently if I had the sudden urge to sneak up behind someone in the rain.

I agree, the Cayman style are really awful and I refused to try them when they were the only option when they first came out. However I love my MJ's and they have brought out a whole range of nicer looking ones, many without the characteristic holes in them. I've heard the Havaianas are really good too