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2 things that i really can't stand- giggles and loud laughs. Ok ok don't get me wrong because that doesn't mean I am a serious person, but i just get extremely irritated when i hear one. Smiles are nice, and laughs make us feel happy. 
But continuous loud laughs and excessive happiness are insults to the brain! 

To stop myself from having one needs extra effort. However, the main problem is to shield myself from being affected by others' which radiate vibrantly to me. Truthfully I am writing this because... i don't know. 
Would a heart feel calm by too much laughing? Or it just sense happiness for a split of a second???