Lately, he calls anything on a ceiling with lights a "sunny". He will call a lamp by it's name and will call certain lights "lights", but mostly things with lights above him are sunnies. Including the sun, obviously :)
He'll say, "sunny on/off, momma?" "ohhhh, sunny!" "Look at the sunny, momma!"
I love it! And just so we all know, I don't plan on correcting it anytime soon :) He'll figure it out one day and I'll be sad. Until then, there are a few sunnies on around the house that we could probably turn off.