1000 reasons you lost a game

91 imo is is half true. My dad loses to me over boredom all the time.

you own a club with 1000+ members

My cat stepped on my mouse-button.

93 You eat your own king

I think 94 and 95 are done but don't have the number so...

96. You run outta battery (did someone already say this?)

97. Your mouse runs outta battery, and your device ain't tactile

98. Teacher is walking around the class

99. Someone tells the teacher that you're playing chess

100. (yay!) Teacher gives work to do inclass

Reason 96 already existed (I don't want to search the whole forum so I don't give the reference.). 98 doesn't mean you lose. 99 does. 
New reason #99! You stand at a precipice and your computer/phone falls down.

Your lil sis slaps u 30 times (happened to me)

don't you both share account? doesn't she want to improve your account? lol

106. My shoes were too noisy and I got disqualified (not a reference to Alireza Firouzja at the Candidates Tournament)

Probably deleted by who wrote it.

Nope, it's "megabrilliant" or "super brilliant", cuz it's the Bongcloud.

Probably because they aborted so much they got restricted:
https://support.chess.com/en/articles/8598007-what-is-chess-com-s-sportsmanship-policy. Also they can only have the option to resign if they don't wait at least the minimum restricted time (5 minutes) between games, including aborted ones.

108. You're going at 30 meters per second in a bike and crush in a wall because you read reason 108 and 108 km/h is 30 m/s.

109. You had to install a new, useless, Windows update (probably happened for real.).
110. (here because it doesn't allow more than 5 consecutive messages in a forum) It is 6 A.M. and you hadn't slept that day anytime yet (in the last 48hrs you played chess.).

111. You die

113.Thanos gets all the infinity stones snaps his fingers and you get dusted

Your cat bites your computer and It (the computer) dies

(happened to me)