There's a little kid I babysit sometimes (age 5) who has taken quite a fascination with drums.
His parents bought him a little plastic drum that is pretty quiet, and he plays with it all the time. It's got plastic mallets attached with lengths of cord so they don't get lost.
I started teaching him rudiments and he knows a few, and can name them correctly.
I started showing him drum-lesson videos from youtube last time, and when Mom & Dad got home he looked up at them as he took a break from practicing on his plastic drum, and informed them that he wanted a "rack tom."
...Mom & Dad looked at me sideways with those parental dagger-eyes -- like he had just repeated a profanity, and they were pretty damn sure he had learned it from me.
(I shrugged with a shifty grin, and chuckled quietly to myself.)