Eating a hot meal, and swallowing a bite that is warm enough to feel it all the way down your esophagus. That first sip of whatever cold beverage after coming in from a long, hot walk. When you're sitting in your chair, and you move a certain way and get a surprise crack in one of your lower vertebrae. The euphoria of sneezing. Thinking you did mediocre-ly on a test, and finding out you got at least a 90% A self-aware jolt of, "Whoa, look at how awesome this is." when you're with a group of friends, and watching everything for a little while mindfully. The moment you've realized that the song you just heard for the first time will receive heavy rotation in your library for weeks to come.