THAT'S the joke?? I was wondering what was supposed to be funny.
Stupid. He couldn't remember his bris.
ETA besides the kid doesn't sit in the chair. The sandek does.
but first they put the kid by himself in the chair
Forget about first, the sandek doesn't sit there at all, no? Isn't it 2 separate chairs? One is כסא של אליהו, and the baby is placed there first, and the other the sandek sits on (and obviously the bris is done with the sandek holding the baby). At least that's the way it was done for my 3 kids brisin, including one this week.