What Size Am I?

We went to whataburger for dinner. If you've been there, you know the drill. You order, they give you a cup, you get your own drink. Well I was doing just that when my dad walked up. I didn't know what size drink I had so I asked my dad, "Dad, what size am I?" Dad looks at me over his shoulder like he's doing an estimate. "I mean...what size drink do I have?" You better believe I corrected myself before he could answer! Ugh, my dad is so.....dad-ish.