Are you kidding?!

Today I am making cards, and I'm working w/ my cuttlebug.  I have my die and the paper, and the sandwich I need to get the paper through to cut my swirl die out.  I got up from my desk to write something down, and E. dropped everything on the floor.  When I said her name exasperatingly, she said, "Are you kidding? What?  Shhh!"  That was NOT said in the correct context, but it's so funny that she said that!  Her little eyebrows were knit together and it was such a teenage look!  Like, how dare you call me on the fact that I did something I wasn't supposed to?!