Tyler laying on the floor has always been an invitation to the kids to climb all over him. Ksenya started it and every child has followed suite.
After all, how can you resist an invitation like this?
It's all fun and games for everyone except for Daddy who has, in this case, decided to play the "I'm dead" game. Doesn't matter what his response though, he's a human Jungle Gym.
I guess if he really hated it he'd stop laying on the floor.