Personally listening to Filteria's bright leads for the first time made me feel like nothing had before. I still get that from some electronic songs that have a real bright white-noise-esque strong long synth leads. I mean great melodies can do it too, or intense atmospheres but something about those specific leads.
Also sometimes from running/working out, runner's high type of thing. Also if I succeed in doing something I haven't before that requires me going out of my safe-zone.