Shove the king up their opponent's nose.
1000 things a dumb chess player would do

1014. You got bored and started playing another game (e.g. Run 3). Then, you see what game status is.
1015. You accidentally throw your computer in the garbage with a whole bunch of junk.
1016. When his parents tell him to go to the shower, he brings his computer with him. Then, it gets short-circuited.
1017. He is playing chess on a tall stool, ok? Then he falls off and breaks his arm. I know, I know, it's not related to Chess itself. but... maybe you shouldn't've sat on such a tall stool?
1018. You remember that you have to babysit your two younger siblings. You go to find them before it is too late, and your siblings have opened a virus on your computer.
1019. You click an ad, it redirects you to a site that gives you 7 viruses. Then, you go to the toilet and flush the computer down the drain because it isn't safe anymore. Then, the toilet gets clogged. (This is a long one, but it's what I thought of!
19.Fork the king and the knight