Don't worry, they'll tell you.
I'd tell you happy birthday, but to me, you've been dead for centuries
They're the one with the dirtiest knees
Don't worry, they'll let you know.
Don't worry, he will inform you after delivery of the punchline has taken place. Just a joke!
Why does it have to be a group activity?
When talking to you, the extrovert mathematician looks at *your* shoes.