You shouldn't leave your drunk friends alone.
Phil is out drinking with Adam at the bar and really has to pee, but Adam is involved in a heated discussion with another patron.
Phil really needs to get relief.
Phil decides to escort Adam out of the bar and to the car, and then drives to the gas station to use the restroom.
Phil decides to make a dash for the bathroom and ends up in line for the urinal.
Adam appreciates Phil watching out for him and buys him some snacks while they're at the store.
Adam's argument ends up getting physical, and he get beat up while Phil is away.