One in the last 10-15 years? Admissions staff have to deal with missing recommendations every year, without fail. Unwilling references, fraudulent applicants, you name it. Trust me.
I had the same thing happen - I was testing at around 700 on the verbal, but got much lower the day of. I think the time pressure hurt me a bit. I ended up with a quantitative of 730 and verbal of 630, writing 5.5. Around 80-90th percentile all around, which I was happy with, but still... you always want to be up another 5% or so, right? :wink: