When is it Appropriate to Tip? [POLL]

We've all experienced that uncomfortable situation of not knowing when to tip. You don't want to feel like a jerk for not tipping but you may not have any spare change to leave as a tip. You're an even bigger jerk if you ask if it's customary to tip because then you look cheap, right? Hopefully, with the help of everyone who reads this, we can help clear up some of the confusion on when it's appropriate to tip.

Regardless of where and when you tip, the universal tipping rate is 15-20% of total ticket price. So if you received good service then don't be a cheapskate when it's time to tip.