What is something everyone has that goes up and never comes down?
What belongs to you but is used more by others?
Here's a link to a (tight) page of 47 riddles (and answers at the bottom of the page) you can print them out for transport, or bookmark them on your computer or mobile device for easy access. I can see some "Plus" benefits out of numbers, 7, 9, 10, 15, 16, 20, 22, 32, 33, 40, 45, 47. (And, just as riddles go, my favorite one of the set is number 21.)
Have FUN out there.