How Much Do You Tip? Should it be mandatory?

Jeff, Bill, and callers start with the complaints from Colorado about Bad Bunny's half time performance at the Super Bowl.  Then it's a conversation about tipping and how Denver still has a 20% service charge added to all restaurant bills.  Is this forced tipping?  What is the strangest place you have been asked to tip?  See omnystudio.com/listener for privacy information.