My father often plays dumb with my boys so that they can be proud of what they are learning but here's what happened yesterday...
Quentin (5) with my Dad yesterday...
Q: Hey, Pap. Your name says P-A-P. It starts with 'P'(sound). Do you know what letter says 'p'?
Pap: No. You tell me.
Q: The letter P! I know that 'coz I'm doing lessons now. Maybe you should do lessons. Your name says p-a-p so it's spelled P-A-P.
Later in the car ride home.... Hey, Mom, would you give Pappy lessons? He doesn't know how to spell his name! And he's old! He should know this stuff by now.
LOL. Has playing dumb ever backfired on you?