I never really gave phobias must thought and never really thought i had any real fears till came across a situation as an engineering intern. I was at a construction site and had to walk across a beam about the width of a desk that was at least 5 stories high. I walked the beam but the guys on the other side were laughing so hard because the life line i was hooked to was vibrating so much due to my shaking hands. that is when i realize i have a very big fear of heights.