This must have happened hundreds to times for nations. Nation A comes and shows of something that he or she presumes is one of the most normal things to have in the society, cue confusion for Nation B who has never seen an object like that and can't even guess what it's used for.
I'm looking for something cute and funny.

Bonus 1: The object is not a weapon.
Bonus 2: It's set in modern time.
Bonus 3: Nation B has been trying to strike up conversation with Nation A for a long time, and feels embarrassed/won't admit that he/she has no idea what the object is.