How to Embarrass and Annoy Your Teenagers (in a good way)

1. Be 45 years old and their parent (usually this is enough on its own)
2. Buy a cheap Ukelele.
3. Learn 4 or 5 chords.
4. Play it at every opportunity. 
5. Enjoy.

Important disclaimer: If you want full eye-rolling and smirking, do not skip step 1, because if one of their friends or even another adult outside the family plays the Ukelele, it is quirky and cool.