DW and I went to TL in 2001, and after a while we walked into the wave pool (which was perfectly still at the moment, apparently having suffered some minor malfunction). Coincidentally, we walked in with two older teenage girls who had just come in to the park and it was obviously their first time there, saying what a great pool it was, there's nothing this big back home, etc. They continued to move into deeper water until they were as far as they could stand, and directly in front of us.
Wave pools are common in our area; the county operates three and charges $5 for admission, so we go several times a year and are used to where the waves break and how to stand your ground or ride the waves.
Well apparently the malfunction was fixed because the wave warning signal went off, which panicked and confused the girls. The asked what the sound was, and I told them it meant waves were coming. They didn't realize it was a wave pool, but thought that was neat, but it seems they didn't realize the SIZE of said waves, let alone how to handle them.
So the first wave comes at them and they are just staring at it. I turned around to try to body surf the wave, and got in into a sort of crouch to jump in to the curl, when I hear them screaming again and a split second later, one of them crashes into the back of my knees and the other one runs into my head. Naturally, I go down in a heap.
Meanwhile, DW has caught the wave and rode in a bit. She turns around and sees these two girls more or less draped over me, and a lifeguard rushing at me because I'm woozy, bleeding etc.
The girls are none the worse for wear and immediately get up and say "let's do that again." Then they saw me, realized what had happened and insisted on following me out to first aid and buying some ice cream. I'm saying really, it's OK, it's not as bad as it looks. They persisted and bought me and DW ice cream sandwiches.
We saw them later on the lazy river and they mentioned how we kept running into one another!