I Just Don’t Have The Conservation Of Energy To Deal With This

(While waiting for lunch to roll around, one of my slightly ditzy coworkers asks this question:)

Coworker: “Do you think if you were strong enough you could lift yourself up by your own arm?”

Me: “You mean one-handed pull ups?”

Coworker: “No, like this.”

(She then holds one hand in the air and grabs it with the other, while not actually holding onto any solid object.)

Me: “Um… no that wouldn’t work.”

Coworker: “Why not?”

Me: “Because… physics.”