Mom stop

Best part about the fact that I was born on my parents 11th wedding anniversary is that every year when they threatened to have the staff sing Happy birthday to me I got to threaten to have them sing Happy anniversary lol. So it would always end in stale mate lol

have them sing it to one of your friends then leave them alone to "go to the bathroom" then watch as they just sit there awkwardly

When I was in middle school we'd do this at random to people in the cafeteria, often multiple times in a month to the same person. You could have bathed in the tears of embarrassment