For waiters/waitresses, the thing that sets them apart from the rest is intuition.
Some have this magical talent to pick exactly what "vibe" the diner is after and adjust their serving accordingly. You know, like people on a first date are fucked so you want to keep it quick and lively so they don't die an unbearable death at the table (because they probably will later, when the guy turns out to be a nutcase and slices her cunt out of her body and throws her off a bushland).
SO here's a tip for those enthusiastic waiters/waitresses that are starting out and are eager to impress:
If the diner's nose and eyes are watering, the dish is too fucking hot and asking if it is too spicy is not required.