Because they're funny on many levels.
By his coughin'
One they've never herbivore.
3, duh. (My ex's 9 year old little sister told me this joke, and followed is up with: "and YOU'RE the math guy!" >< Burned.)
Because 7, 10, 11.
To lift his spirits.
Cuz you know something's about to go down. Im sorry
His desk is level
HR Department.