We have, accidentally, and it was rather expensive, lol. We had a massage slide on top of our king size bed, and had a fairly wet session, all three of us had already gone once or twice so it was sloshing about a bit when one of the girls put a high heel through it (don't ask, it's what we do) but we didn't know when it happened. The entire contents was avidly soaked up by the mattress, and it couldn't be cleaned. It soaked up so much, I think it put on an extra 100kg. Turning it over didn't help, damp spots had already appeared on the opposite side.
I was on the phone the next morning to