Each Friday morning I post a riddle to get you to think outside the box and exercise your brain. If you are stumped, share it with a friend or colleague and see if you can figure out the answer together.
Leave your answer in the comment section. I’ll approve responses later in the day to give people a chance to respond without seeing any spoilers.
This week’s brain teaser: I am only useful when I am full, yet I am full of holes. What am I?