Thunderduck, thank you for disclosing your balloon phobia. I never 'met' another adult who had this! You described it perfectly. The tension of waiting for it to pop, strong startle reflex, not being able to relax until someone takes the balloon away---that's completely me! Once at an outdoor cafe, I couldn't eat dinner because there was a balloon rolling around on the deck. I couldn't stop watching it, was sure it would catch on a splinter and pop. Finally, heart pounding, I went over, picked it up and made a tiny hole with my teeth near the knot so I could let the air out without popping. XH thought I was completely mental.
I can remember not liking balloons much as a child. There was a party I went to age 5ish, where we had to pop balloons by sitting on them, and I remember hating it so much and being quite scared. It really got worse in adulthood though, no idea why.
Anyway, thanks again, I don't feel quite as weird now.