Did this in a couple of classes as well: each one got the class roster and asked to indicate who in the class they know on an ordinal scale (never seen, met, knows etc) as well as asking for some attributes (major, gender, age). Subsequently used when introducing various network metrics etc

Funny! Though they do acknowledge that yeah, something went wrong with the labels, and that Putin indeed is the president of Russia and nothing else etc.

Hey, hey, hey!
You just lit up the way,
So I know what to say!
I'll say: Bombay!

Yes indeed many potential ties between two actors. But they would all still be related to the same "ordered pair" (of actors), which might not make the notion suitable in a multiplex setting