Hilarious ... My little sister told me this and I wasn't expecting it at all. :
Ask them if they play league.
A: When they even put their ear up to the bathroom keyhole.
Those who understand binary, those who don't, and those who weren't expecting a base 3 joke.
F-Well I know you, so I'm expecting very little. Mission accomplished.
A Nii-san
Because you already know who it's isss! My little sister told me this joke.