Why would a teenager need a house anyway ?

It’s two variants of the European socket (type E and type F), nowadays most plugs are compatible with both versions so you can buy either one. Just check your plugs before.

Here is an illustration of both sockets:

Type E

Type F

Played well, this could be a free pass for all the other times the person is late.

Next time they are late they can put on the silver jacket, enter the classroom with a space related excuse:

• Sorry, the traffic was awful on the asteroid belt
• My comet was delayed
• A gravitational anomaly threw me out of the solar system, it took me forever to come back
• …