I'm glad someone said "buttocks". My mum was complaining about pain, and I was asking where. She was getting angry at my "mumbling" (never her being hard of hearing, of course!) and she ended up shouting "BUTTOCKS! BUTTOCKS! BUTTOCKS!!" at me. 
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some real beauties here that can't possibly be topped ! The first word that came to mind after reading the title Q, was 'ghosts' as it's always been a thing for me
both saying and hearing the sts snake hiss at the end sets me off, a similar kind of flinch reaction like if I see a spider dart or see/hear a wasp buzzing nearby 