J-Virus
The J-Virus is when someone in your group takes off for no good reason and then shows up later like they were never gone, even though they messed up your plans.
Left the game night to 'go to the bathroom' and came back to say they wanted to play too.
Dropped out of the group trip to 'find their phone' and showed up later to complain about the weather.
Exited the hangout to 'get a soda' and came back to say they missed the best part.