Scottish, and that's because I'm very rarely exposed to it. I like the accent though DESGOSTANG!

Glaswegian. My family is Scottish so I'm pretty good with Scottish accents as a whole but Glaswegian and other really thick accents like that are just incomprehensible to me.

welsh accent

I have a hard time understanding Indians when they speak english

But when im speaking Spanish, I have a difficult time understanding Puerto Ricans. Their spanish is so fast and different from the castellano Spanish that I speak.