This is a test of commonsense. Complete the next sentence:

How to keep cats from drinking out of glasses
Remove from glass if you catch it drinking.
Cats can be sneaky, but you will sometimes catch it drinking from your glass. If you catch them, take them immediately away from the glass.
Your cat may run away if you catch it drinking from your glass. This is good, since it means they at least know they are not allowed to be doing so.