...they will be more fearful of your apparently random laughter than you will be of their 'looks'. It would certainly scare me.

But, in that vein: when I was very young I worked for a company structured in a rigid hierarchy, and my immediate superior (a middle management dweeb) was an evil bastard. Truly evil. But a great whistler.

He would, on occasion, throw the head back and whistle like a heedless child sauntering through childhood's summer meadow, lost (as we thought) in the gentle revery of his innocent thought...not a care in the world.

But here's the problem. My fellow plebs and I noted, after a time, that he would only whistle so after having visited his superiors and completely shafted one of us - this is what had inspired his air of smug self-satisfaction, inspiring him to flights of reflective, joyful whistling....

But we got him, in the end - he whistled less, as time went on...

Perhaps this is how they view your laughter?

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"A man's work is nothing but this slow trek to rediscover, through the detours of art, those two or three great and simple images in whose presence his heart first opened."