putting my foot in my mouth!

Today in Biotech class we crushed fruit flies in order to obatin their DNA, now after the intial crushing I had made my group into an assemly line where they would bring their tubes with crushed flies and I would then add lysis buffer. So after adding buffer for everyone, I was waiting on this kid John so getting impatient , standing with lysis buffer still waiting , I blurted out

'Open up your Fly, I am ready for you!'

John was caught off guard, class ruptured into laughter and yep I was red!