It's part of the job description...

So we're studying light in chemistry (and consequently, wavelength and frequency, etc.)

Me (solving a problem at the board): So the equation you want to use is c equals lambda nu, which you could also rearrange so that it's c over lambda equals nu... Do you want to hear my favorite science joke?
(They looked a little wary, but they said yes...)
Me: What's new [nu]? ...... c over lambda.

Cue laughter and moaning and affirmations that I am in fact a science nerd.

Mr. Arrogance: Man, it's like all of you guys!
Me: What?
Mr. A: All of you, Ms. SeniorSeminarTeacher, even Mr. MathTeacher...
Me: What, we're all weird?
Mr. A: Yeah! You're all crazy...