I had a water bed in College and my first 10 years of marriage, my wife loved it when she was pregnant with twins...until she got to about 7 months and couldn't climb out of it!
She looked like a beetle stuck on it's back, arms and legs flailing away, screaming, "Help! I can't get out!"
We gave it away when we moved, but I did love that bed, made a lot of babies on that thing!
Do they even make water beds any more? I haven't seen or heard anything about them in over 20 years.