Any, besides the ones that are easy...Rhode Island Reds, Barred Rock...the ones I see that are a little more difficult to know exactly how to say it. Like Cochin....how is that pronounced? Brahma? Marans?
At some point i'd like to meet other BYC members, and don't want to sound like a fool, lol.
Glad you asked. I often wonder myself about how to pronounce some of the breeds' names.
Another thing that drives me nuts is when people use initials for their breed. What's with that on a forum of many levels of "chicken" experienced members. We get many NEW members every day, and they especially need consideration from all the members.