Entertain Customers (Guests)
Guests love to be entertained along with their fine meal. This could be live entertainment or even a nice clean joke. Take note of the clean joke rule along with no ethnic, blonde, handicapped etc jokes. If telling a joke make it short and simple even a lame or corny joke works.
If the guest is celebrating a birthday or anniversary, sing to them.
A duck and a squirrel are having lunch together.
Who pays?
Why the duck of course, he has the bill.