Our party has a scout that’s secretly a drow; he keeps his face hidden under a hood and lived in the Underdark most of his life.
DM: …and you all end up at the White Dragon Inn.
Drow, IC: What’s a dragon?
[Cue laughter from whole group]
Me OOC: I’m gonna pull you aside and tell you what a dragon is.
Drow OOC: Ok?
Me: I tell you that it’s a really big lizard
Drow: Okay, I’m basically imagining a giant gecko.
Me: I’m gonna let you believe that’s what a dragon is.