Mug - Fart Trapped

It came out of your botty, made a weird noise and a funny smell, what could it possibly be and why is it there?  If you (hopefully) can't see it, are you sure it's there?  Is it invisible?

What is it and what is it for?

So many (as yet) unanswered questions, all of which can be answered by this mug.

With the help of this mug, you can rid yourself of these plaguing questions and have a good night's sleep.  Go on, treat yourself to that.