(Daily Finance) — Where do you fall on the tipping spectrum? Do you hand the pizza delivery guy a $20 for your $14 pizza and declare with a grin, “Keep the change,” or are you the type who slips the bartender a folded-up $1 bill and hopes he won’t notice until after you’ve downed your $16 martini and skedaddled?  In honor ofLarry Fox, the New York City deli delivery guy who outs bad tippers on his website,15percent.tumblr.com, (and got fired for it),DailyFinanceoffers a guide to avoid winding up among Larry’s gaggle of gratuity grinches. We turned to Jacqueline Whitmore, the founder ofetiquetteexpert.com, for advice on how much to tip.

Food server:”I know it’s hard to believe, but 18% is the new norm — 15% is the absolute lowest,” she said. “These people work very hard. They’re even bussing tables now. This is their livelihood.”