These days you're likely to see a tip jar when you go into a coffee shop, a sandwich shop or any other place with counter service. Clark was recently in a rental car van and the driver was very helpful with his traveling partners' suitcases. Though he usually wouldn't, he did tip in this instance. But there's this constant grey area when it comes to tipping. Most people know to leave a tip for a server; a bellboy who helps with your bags; a housekeeper at a hotel; or a concierge who does something for you. Money Advisor recently asked people how often they put money in the tip car at pizza shops, ice cream parlors and the like. 48 percent said never; 3 percent said they pretend they never see a jar; 4 percent said they always tip when they see a jar; and a little less than half said they occasionally pop funds into the jar. Meanwhile, Clark is really confused about this one: Should he leave a tip when he goes to pick up a pizza at a chain?? He has no idea!