Flibbertigibbet

Why Do These Guys Spit into the Toilet?

I've noticed that several of the men in my office spit into the urinal or toilet before urinating.

I know this because I can hear it hit the water and the sound tells me that it is a liquid and it is not very dense and it is falling from a height greater than that of waist-level. It seems that they're just pushing some bubbly saliva to the front of their mouth and letting it fall into the toilet.

One of the males has done this for years, but I recently noticed that a couple of other men are doing it, too.

I don't understand why. If you know, please tell me.