In addition to my professional activities, I have time for a few hobbies.
One of my favorite hobbies is telling jokes. If you want to hear most of them, you'll have to see me in person.
Q: How many professors does it take to change a lightbulb?
A: Only one, but he gets five publications out of it.
Q: How many energy management students does it take to change a lightbulb?
A: None of them have read the textbook yet so they don't know what a lightbulb looks like.
And here are some links to other lightbulb (energy-related) jokes.