Yep. With the chili that I make it always taste spicier the next day. I used to like Duncan Donuts lemon Donuts after sitting in the fridge a day or two. I always thought they tasted good after the dough went a bit stale.
Anyone saying any kind of pasta (spaghetti or lasagna) must not eat good pasta because there is no way old pasta is better than fresh pasta. Pizza is the only thing that might fall under this category and a family pork recipe we have.
You know, you're right.... I guess I'm saying spaghetti is the best left over to have the next day(because it's awesome the next day) ....not necessarily better than when it was first cooked.