Is uncontrollable laughter at serious moments a dating turn-off?

I've always had that issue. I don't mean to laugh but once the laughter starts, I can't stop it for several minutes. At times this happen during bad moments too. By the time I stopped, I'm in tears by then.

It happened at the theater once. I was watching a movie with my brother and two long-term friends. There was a part about someone having cancer, the nurses assisting the poor man and that's when the laughter happened where I couldn't stop. It lasted about 10 minutes. I hate this.

Is this a turn-off. I do not mean to laugh and don't want to but once it happens (less than before), I can't stop it at that moment.

Is uncontrollable laughter at serious moments a dating turn-off?
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