"Put your mask on."

Ah ah ahhhhh, you didn't say, "Simon says."

When they say, "Simon says, 'Put your mask on.'" you laugh in their face and say, "La la la la la I can't hear you."

Then tell them to put their mask on in a silly high pitched whiny voice. Then copy what they say next and immediately yell "Jinx!"

When they try to talk, remind them they can't talk while in jinx until someone says their name. Inform them of their jinxed status repeatedly, to respect the law and others.

Either they laugh or get angry, both instances are funny as hell.

You want to be childish, I gotchu.