One of my normal-weight friends rented a boat a few weeks ago, and we took it out to a lake and went swimming. The ledge to climb back on to was inconveniently high, but not ridiculously so, and there was also a rope that people could use to pull themselves up. My friend couldn't get back onto the boat. I nearly died laughing. Then I started taking pictures. It took 2 of us to pull him in.