What are ears for? Listening? Certainly not. That theory has been disproved time and time again by my defiant little 4 year old.
If they're not for listening, they must be good for something, right? Hm... how about putting a very small foreign object in one of them and then not telling anybody so that, like, a month or so later it is being cleaned out with a cutip which causes you to wince and exclaim "Ow! That hurts!!" and your mom and dad get a flashlight and look inside your orifice to see what could be causing you this pain and your mother says something like "Oh my gosh- there is something bright red or hot pink in there!" and then your father says "Duh- come on, that's her EAR DRUM" [yeah, since ear drums are visible with just a flash light and they are HOT PINK]... and upon further inspection the father says "Huh... I guess it's not her ear drum... what IS that...?"
Mom asks if you remember putting anything in your ear and of course your answer is "No."
Dad then proceeds to try to get it out with tweezers, but to no avail since they're too big, so then it's time to take you to instacare where the doctor uses her tiny little tweezers to pull this unknown bright red thing out of your ear while you scream because your ear hairs are being ripped out along with the tiny foreign object.
The then doctor places the tiny, bright red, foam heart sticker on the table. At which point you might say something like "Oh yeah... I remember putting that in my ear."