From post 107 of the other thread:
"Before the mumps vaccine was introduced in 1967, the United States had about 200,000 cases of mumps every year, with 20 to 30 deaths. Mumps was also the most common cause of acquired deafness and of viral meningitis, an infection of the lining of the brain. Up to 40 percent of males infected with mumps after puberty develop a painful swelling of the testicles called orchitis, which in rare cases can lead to sterility and testicular cancer. Today the United States has about 350 cases of mumps each year."
That is MUCH MORE than "unpleasant".
You don't have a lot of luck with your information, do you?