Do you detest other people drinking from your cup? Simple; just keep it locked. This seemingly simple coffee mug by Israeli designer Efrat Gommeh has a âlock holeâ at the bottom of the cup. Unless a person has the key, which is unique to every mug and is more of a lock than a key, you can NEVER drink out of this one! Unless you plug the lock/key in the lock hole, the liquid inside will be all over your table, not in your mouth! So, stop worrying about others using your coffee mug, they just canât. Now, thatâs what I call personalizing your personal stuff!