The Stopped-Up Watch

From the look on his face, Edwin hasn’t taken a dump for over a week.
From the numbers on his wristwatch, you’d be right.
You see, he keeps a running timer on his wristwatch to count the time since his last dump, and right now it’s saying a week.
When he takes a dump, he resets it.
But not recently. Since he hasn’t taken a dump.
Wait – he’s running off to the bathroom.
You’ll probably be able to tell by Edwin’s face if he’s taken a dump.
As long as it’s been, he may not remember to reset the watch.