Did I just say that out loud?

Okay, we're continuing our discussion of Newton's Laws of Motion. I'm showing them my big jar of Martian eye balls (olives) and how they stay still in the jar when you spin the jar really fast, why rockets take off using balloons. Then, it comes time for a net force demonstration.

I say:
"what would happen if I took a straw and blew on the ping pong ball sitting on this table."

(you can tell this is gonna be bad- I said blow and ball in the same sentence. Already my radar is going off)

I set the ping pong ball on a small table.

"I need to volunteers. You girls over there, y'all have been blowhards today come on up."

"Now get on your knees, in front of this table"

(Oh, shit)

"Now take your straw and blow on this... this.... thing.... with out letting it fall off the table."

(I couldn't even look at the class)

One of the girls is blowing so hard the ball keeps flying off the table

(Don't say it, don't say it, don't say it. Don't look at anyone)

"Don't blow so, um, hard"

It is a testament to how much reserve and willpower I inherited from my father: I never even cracked a smile.

But damned if none of students laughed either.