Chin-ups, dental floss and the inevitable give-away

I have just finished my first set of chin-ups when I hear the distinct shuffle of slippers overhead. I turn around and my mother is peering down from the top of the stairs at me, dental floss still in hand.
"What?"
"I want to see you do them."
"No! I just did some! Go away! I have performance anxiety!"

She is still standing there, waiting expectantly.

"Really! Go away! I can't do them with you watching me!"

She disappears. And as I get ready to do my second set, I hear the distinct 'ping! pong!' of flossing action still at the top of the stairs.

"I can hear you there still. I'm not doing any more pull ups. Go away."

I did try, though, to do at least a few more, but somehow I kept laughing and now I know why you never see athletes laughing while they do their thing. It's pretty much an impossibility.