Weirdly I'm afraid of public restrooms. I'd rather hold it in for 20 minutes to use the comfort of my own toilet.
I know other people have the phobia that I have--I'm afraid of dogs. It can really negatively impact my life because dogs are everywhere.
I know someone who is afraid of the inner part of their wrists and other people's wrists as well. It makes them physically ill.
The Home Alone series (trilogy?)? Perhaps Liar, Liar with Jim Carrey?