You and Sam have been working together over the years. So, you've caught onto a few things.

One of them being: he looks hilarious when he's annoyed. So you took advantage of it. You began pranking his cubicle since you've sat in the one next to him.

Sticky notes, covering his entire cubicle, it was a classic.

"Seriously?!" Sam groaned as he looked at the Sticky notes covering his computer, keyboard, everything.