This is the so-called “security mug”, one of the listed weird household items at Funny Cool Stuff. By far this is the item I like the most of all the listed ones, simple idea yet useful. The hole there is to prevent anyone else but you to use the mug. When the real owner wants to use it, just simply plug the black thing in. Other people who don’t have the “shaped key” will have their fillings flow all the way out of the hole. -Link
I guess you could use this at the office, where you don’t want your cup to be used by other dudes. Or babes
Babes lol,and they think you’re stingy for not letting them to use.So they don’t want to have relationship with you.
Funny mug! hahaha. I never seen this before. This is an ideal mug at home if you don’t like your brother to use your own cup or your security mug.