This sort of relates to the "most missed restaurants" detailed in past threads, but I'm going for specific, ethereal moments from restaurants past and present. I have a few (I may have mentioned these before):
1) 2005 family style dinner at T&S Seafood on N. Lamar. My birfday. I think that we had a 10 or 12 group, and they just kept bringing out all this seafood. Now that T&S is going, it will just be nostalgia.
2) Acorn Cafe on Guadalupe circa 1993. My sister and I were riding bikes, and we were freezing and heading north uphill. Rolled up to the place, and the sign said the soup du jour was chicken and dumplings.. Sounded soooo good at the time. Sat down, and the German lady that owned the place said, gruffly, "we're out - we have spinach cheese." I was imagining the worst, but it was the best soup ever and I've made it many times since. Lentils and nuts and shit in a veggie broth, tons of spinach, and shredded baby swiss drizzled over the whole thing. My sis and I get all bleary-eyed when we talk about it.
3) Rib festival 1990's - sorry to repeat it here from another post. But I was on bikes with friends, we were starving, potentially high, pocket full of cash, and we rolled over town lake smack dab into a pork rib festival (before food festivals were cool).
4) Fist time I'd ever seen orange beets in the late 90s. Dinner with a very close friend in the front window at La Traviata. Seared scallops with baby greens atop grilled golden beet disks.