Holding an elevator door for someone and watching someone else bull their way past you both.
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Watching someone in an SUV trying to make a right lane change, with that person cradling a cell phone on their left shoulder, while trying to look over same shoulder.....

Who knew the human body could contort into a position like that?

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Making treats for the people in the office...
They go to eat the treats in the break room and someone sees them eating YOUR creation.....

FIVE MINUTES LATER you have people in your face, saying something like,

"I see you brought ------- for Sally, why didn't you bring ME something?"
Or
"You made ----------, where are mine?"
Or
"Do you like Sally better than me, I see you brought her ---------- this morning!"