Waiting in the home gym

"Jacob, I want to show something to you!".
"Uh... Sure, but ca-aaan this wait for a few minutes?" Jacob groaned. "Uhm, I'll be waiting for you in the home gym then!" David said and went his mary way.

Half an hour later Jacob came down into the home gym in the cellar.

"So, what did you wanted to show me, Dad?" Jacob started but then immediately stopped in his tracks when he saw a bizarre scene in front of his eyes.