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The J-Virus is when someone in a group bolts out of nowhere for no reason and comes back later like they were never gone, but they still expect to be in on all the fun.
Left the party at 9 PM to 'find a cat' and came back at 1 AM to complain about the pizza.
Skipped the movie to 'check Instagram' and showed up at the end to ask for spoilers.
Vanished during the game night to 'get a snack' and then demanded to know what happened in the final round.