Brian, a couple things. First off, I just have to be honest, we're just as astonished by the performance as you are. These are subtle changes and very few changes compared to what we intend to do that are already driving pretty big time results. So -- and honestly, they're so hot off the presses that we haven't even had an opportunity to dig deep enough into the drivers to fully understand why the guests are responding so favorably. So keep in mind, there's just more learnings to be had and you'll see some of that. We'll talk about some of that in the future. When we look at Buttery Jack and the launch of that product, we look at the mix on that, it's the highest we've ever seen on the launch of a permanent new item, at least during my entire time at Jack in the Box. And we can't seem to find anyone who's been here long enough to say that we've had a product that performed better than the launch of the Buttery Jack. So this is, as we said in the prepared remarks, pretty unchartered territory. But when we look at the-- we go back to the research that we did last year, the way that we have sort of come to reason with the results is when we looked at how the consumer rated our hamburgers, in the research, they rated them pretty poorly compared to our competitors. Yet, when you look at our average unit volumes and what we're able to achieve as a brand, we fare pretty well. So when we dug into some of the more qualitative side of that, what we found was the consumers have their sort of fan favorites on our menu. Things like the Sourdough Jack. But what they don't say about our burgers is that we holistically love your entire line of burgers and we holistically believe that you're selling us quality products. What they say is, "We like this one product." So we're getting the benefits associated with that, but what we were not getting is the halo associated with the belief system that Jack in the Box's entire menu, and particularly, their entire line of burgers, are craveable. So when you look at the launch of Buttery Jack, Sriracha Burger before it, as I said at ICR, these are all great sort of foreshadowing of where the entire menu will go, and it's exactly what the consumers said that they would respond to in the research. So although it's a few things, those are the drivers.