One day in the men's room

In a Daily Kos diary, Kharma describes his men's room experience:

Two weeks ago, the kids and I went on a trip to visit friends in San Antonio, Texas. On the way we stopped at a rest area just off the interstate. What happened next made me very uneasy...
I was drinking coffee heavily so that I would stay awake and needed to relieve myself pretty badly. I pulled into a rest area, locked the car doors, left the kids sleeping in the car, and went into the restroom. When I entered I noticed it was unoccupied except for a pair of sneakers visible under the second stall.
As I unzipped at one of the urinals and began to relieve my burning bladder I heard a voice say "Hey, what's up?". I looked around and there was no one else in the restroom. After a moments hesitation, I answered "Not much".
A little time went by and he says, "What ya doing?".
I didn't feel very comfortable talking to someone in a stall but I didn't want to be rude and answered, "Uh...we are heading to San Antonio to visit friends."
"Want to come over?", he says.
At this point I am really uncomfortable and I finish up and scoot over to the sink to wash up. "No I don't think so", I replied. Wow, was this something else. I had never even had someone next to me with a wide stance before and now I've got someone in the stall asking me over!
As I reached for the paper towels to dry my hands I hear, "Hey man, can I call you back? There's some asshole in the bathroom answering every thing I say."