My Coffee Caffeine Conspiracy

I confess, I once spiked a customer’s drink with an extra shot of espresso just to watch their caffeine-induced antics. They were bouncing off the walls and couldn’t stop laughing. Of course, they probably thought it was just one too many espressos. But honestly, is that okay? Do baristas get a little license for harmless pranks? Am I the only one who’s ever done something like this?