[Rei isn't laughing. This isn't funny, it's just an unfortunate series of events. So, she quickly calls the waiter over and explains, ordering a second hamburger, this one called the Dis burger, for the second layer.]

I'm sorry, Rayfa-chan. Brain freeze happens when you have something cold too fast. It cools the roof of your mouth, and tightens a nerve there. Your tongue will warm it up.

[And...because she's a good senpai.]

And I just got you a replacement hamburger. It's nowhere near as hot, but it's still got spice to it. You'll still get to eat, don't worry. And I promise you'll like this one. I've had it, and it's more like a spicy curry, but with jalapenos instead of curry spice.