Apparently the hard-to-find bottle of blinker fluid is made out of Mountain Dew. Doesn't say how they make it blink, though.

Looks like a Dew bottle filled with Chem-Light juice. I use to do that all the time.

You spray it in your eyes, that will make you blink!.

Roger.

Actually, the caption says this:

The next time I spill Mountain Dew in my headlights, I know what I'm adding!

FACT: just the other day i was looking for paint for my grill and a dumb girl at the parts store counter next to me was complaining her blinker didnt work right and i told her to go back in the corner of the store i saw some blinker fluid back there and she said oh really? and the guys behind the counter busted out laughing.

good times.