h-y-p-n-o-t-i-s-e

Max: Daddy, how do you spell hypnotise?
Me: h-y-p-n-o-t-i-s-e, why Max?
Max: oh, no reason, just checking...

A few hours later I noticed my web browser had been left on a Google search - 'how to hypnotise people with a yo-yo'.
Should I be worried?
Maybe it's too late and I've been 'done' already.
The boys have been playing with a yo-yo a bit over the last few days...
:-)