I believe he is from Macedonia.

All of my keys are in the belt holster. Moreover keyring is tied to the holster with a 1 meter long rope. Tip: Arrange your keys in some order on the keyring; Preferably in the order of opening/closing of the doors.

What about storing your phone in a Faraday cage?

Be aware if your language choice is based on build-in constructs, such as C++ vector. They sometimes are prohibited. Though if you are allowed to use standard library choose the language with the most powerful one/best known to you. In this case you will never face a need to recall quicksort algorithm, but simply call sort() method which is faster than everything you probably can write.

In the DOS version of good old Partition Magic OK button was grayed out until the user typed OK in a text box. This was done in some important dialogs, like one for full format of the partition. Also you may try to set a delay and prohibit to close dialog box till its end.