My mug
We can understand this one, we all have our favorite glasses and mugs at home that we don’t like anyone else using. This person had enough of sharing and just decided that it was time to get a lock. Now with this new system, nobody will ever drink out of their mug again.
Congratulations, you have won an award for the pettiest security system we have ever seen. Who is this possessive over a mug that they felt the need to lock up? Maybe they are a germaphobe and this is just some extra insurance to put their mind at ease while they are not at home and their mug unprotected.