For context, our party was trying to smuggle magical items into a kingdom so we didn't need to pay any fees nor have anything confiscated. One of our party members went ahead to see if the guards actually had a way to detect magical items.
He showed the guards two dice, and claimed that one of these dice would explode into a fireball when it rolled a six. Unfortunately, he didn't know which was which. The guards were too lazy to find a solution, so they called up a nervous trainee to deal with it.
Trainee: "H-hey sir, s-so what does this do?"
Monk: "So one of these dice explode when they land on a six, do you have a way to tell which is which?"
Trainee: "Uh-uhm, not that I-"
Monk: "I could just roll them to find out :D"
Rolls dice, both land on 1
Trainee: "NO, NO dont- dont do that anymore, uh- I- I think I confiscate these? And, uhm, im pretty sure thats a 5 gold fee?"
Monk: "What? No, you're confiscating it so you shouldn't be charging us." (There was, in fact, a 5 gold fee)
Trainee: "I guess that makes sense..."
Monk: "Alright, that's all the magical items we have!"
Senior Guard: "Aren't you gonna check their bags?"
Trainee: "R-right, uh, sir- I need to check your bags"
Monk: "OH, Right, I think I have one more magical item. I have a potion that when you drink it, it makes you drunk."
Trainee (suddenly confident): "Well then, im definitely going to have to confiscate such a magical itemđ"
Senior Guard: "Did you check their bags!?"
Trainee: "Yep!" (He didn't)
Monk: (To our party) "So was it that dice set or the OTHER dice set that was explosive?" And we dissappear into the croud :P
I dont know if that guard was old enough to drink but at least we didn't get out sentient book with all our important information confiscated by the guards. Guess it was a win-win.