I used to ask the clerks at the bank for $2 notes. Then I would go spend them at stores. I found it to be lots of fun. Some cashiers didn't know where to put them. Some turned around and gave them as change to the next person (this happens a lot at Ren Fests and usually makes the "next person" real excited). One caused lots of laughter in the store when they asked over the intercom "do we take $2 bills?". The most annoying was at a toll booth where the attendant handed it back and said "we don't take Canadian money" (I also had this with $1 coins).

Nah she was busy as anything so didn't really have time to look. She might have caught on eventually but my parents did first, they saw me with a few of them and figured out we'd been pocketing our lunch money while scamming free lunches. Made us pay back all the money plus extra then work off anything we couldn't pay which is pretty fair tbh.