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In the saferoom, Dave and Jack were doing their usual bullsh^t, and that today being Dave getting gasoline on his back from falling into an isle of them at the store. He hadn't bothered to change. Jack thought it'd be funny if he used his lighter for something other than his cigarettes...
While Dave was distracted, Jack took out his phone and started to record. He grabbed his lighter, flicking it a few times for a flame, before setting Dave's back on fire- or his clothes. The fire immediately appeared, and Dave reacted a second too late. His ass was now on fire.
Dave screamed, trying to put it out, before running out of the saferoom to look for something. Jack followed him into the outer area, they ended up in the prize corner.
Jack saw his siblings Peter and Dee just watching as Dave ran around like a cartoon character. Jack continued to record, laughing his ass off. He knew this wouldn't do a lot to Dave- they were undead, and it wasn't like Dave was as flammable as cotton, only his clothes were.