I was introduced to my first computer at age 7 (1975) and thought it was the most amazing thing ever. Pretty much from that point on, I knew that's what I wanted to do with my life, and because of that I wanted to go to MIT. I spent the next ~10 years with that goal in mind, got good grades, great test scores, AP classes, etc. And because of that, I was invited to a special event that MIT held in the D.C. area to recruit the top students, and they had many of their current students from the area attending. It was the most excruciating couple of hours I had spent--they were the most arrogant, conceited individuals I'd ever spent time with. I couldn't possibly see spending the next 4 years of my life like that. And that ended any thought I had of going to MIT. I ended up at the next best dual-degree program I could find (Washington University). Interestingly, my best friend had the same experience as I did--ended up going to Georgia Tech.
I've been up to Cambridge a few times, and sometimes really think it might have been a great place...if it weren't for that attitude.