What IS a Hamburger All About?

We drove to Phoenix.
"You aren't in much of a hurry." I muttered.
He sighed, "When you have a time machine, you don't have to worry about being late."
Aleck and Peter had been told to meet us at an In-N-Out in Phoenix, and, as requested, they arrived at 6 PM last night. We ordered and waited for our order.
"Hmm...we're numbers 8, 9, 10, and 11..." Ludwig sighed, "if only number 12 were here to join us...."
No idea why he had to throw that in, but we were all silenced. Actually, we were already pretty silent, but after his comment, we were even more silent.
"Number 7" was called out.
"So why are we here?" I asked.
Ludwig looked sideways at me, "because we're hungry."
"Number 10 and number 11!" Ludwig and Peter sighed loudly, and Aleck and I went up to get our orders.
I sat down and began eating my cheeseburger.
"Number 12." the two without food moaned again.
"You know," Ludwig began munching on my fries, "there are no In-N-Outs in the future."
Peter's head darted up from where he was hungrily eying Olecks' protein burger, "you're kidding me!"
"Number 13!"
"Deemed far too likely to cause obesity." Einstein said matter-of-factly.
"That's absurd!" Peter protested.
"Numbers 8 and 9." Ludwig and Peter jumped out of their chairs and came back a few minutes later, each with trays loaded with food.
"It appears you both have something in common." I mused.
Ludwig took a big bite out of his burger, "I'm sending you guys to the future."
Peter swallowed his fries, "If it's to keep In-N-Out from being banned, I'm in."