To a woman who tipped me 0 percent on a $70 check: I make $4 an hour. You might be thinking, "Well that's more than the usual $2.13...," but keep in mind that not only am I taking your order, checking in on you every 15 minutes, and cleaning up the beverage your child spilled, I'm also busing your table, doing your dishes, and I was the one who made your salad. I'm underpaid, so when people like you decide not to tip me, I might as well be working free. Tipping isn't hard.