Kerchief Puns

My dad and I went to lunch today and I was telling him about the things we are learning in my circuits class. I told him all about voltage, current, circuit elements (this is ECE 101) and all kinds of stuff.

Then I start to explain Kirchoff's circuit law... He says "Not to be confused with Kerchief's law. You know, that law about blowing your nose the right way. I think his name was Hank."

He starts laughing as I groan...