What Can I Say Except You’re Welcome

(The foyer is getting noisy as customers exit a theatre that has finished screening, and popcorn is popping. I have just finished serving a lady and a few customers have built up behind her.)

Lady: *walking away* “Thank you!”

Me: *getting ready to say, “Next, please,” in a raised voice, but caught off guard by the lady’s “thank you,” I direct towards the next customer an unnecessarily aggressive* “THANK YOU!”