Answer: The food that carries an unfavorable association for me is spaghetti. Worms in red sauce is what I think when I now see a plate full of cold, greasy spaghetti in front of me.
I used to love spaghetti, twirling the noodles around my fork or slurping the long pasta strings into my mouth.
However, all that changed when I was 12 years-old and attended Outdoor School. A week long hands-on, science based, environmental, nature, wilderness appreciation class; like camp, but without the fun. The experience was cut short by food poisoning. . . by you guessed it. . . spaghetti. Trust me when I say, pasta noodles and spaghetti sauce do not taste good coming back up.
. . . so please do not ask me to attend any spaghetti feeds.