This is a nice way to introduce the IDEA of functions to students as it is very real to them and what they know.
We talk about two sets of celebrities with the rule being assign each man to the person he has dated. Is it still a function if Nick Jonas and Justin Bieber dated Selena Gomez?
There are no mathematical examples here, so consider this a supplement to the textbook.
It is a word document, so feel free to customize in any way. In my class, I use my name instead of Tom Hanks to get some laughs.
All the best