1. heights: Still get butterflies in my stomach while on a plane
2. Afraid of speaking in front of a group. Trying hard to overcome it. (Notice ironically this doesn't amount to posting in a forum where so many people can read).
Well speaking in public is normally the fear of having all those eyes looking at you. I never had that fear, I just talked fast because I usually didn't care about the subject and just wanted to get it over with (I really hated when they asked questions on the subject because they figure out quick I don't care as I usually gave answers that showed I didn't bother researching it thoroughly).
How about the fears you have heard that made you laugh. I remember they had a show a few years back about fears. They had fear of: clowns, pickles, tin foil, bugs, handicapped persons, germs, hair, even light.
If it exists, there is a phobia for it. Some people fear them, but almost everyone is uncomfortable around them. Like I said, there was a show were a guy and woman had fears of anyone with an obvious handicap (limping, limb deformation, wheel chairs). Then there was a talk show my wife watches where a woman was uncomfortable around anyone in a wheelchair. A comedic actor was paid to act like he had to be in a chair and the woman wouldn't look at him at all, but once he stood up she had no problem looking at him and talking to him. I remember her even saying, they weren't people and she could never marry a person like that.
I obviously don't have that fear or uncomfortable issue.