Borrowing a pen to make friends with (potential) enemies
There are people out there who might dislike you for the vaguest or even inexplicable reason. If you feel like you’re on the undeserved end of the hate stick, ask your “nemesis” if you can borrow a pen or something small and insignificant.
According to social customs, not helping someone in need is considered rude. If they have a pen to loan, they’ll give it to you almost every time. Don’t forget to return the pen back with a cheery “Thanks!” You might not be friends just yet, but at least you’ve given them a reason not to hate your guts.