Mariah Carey's voice opening garage doors.

I heard somewhere that a recording of a Mariah Carey song in a car was so high pitched that it opened up an electric garage door. I feel silly asking this question, but that’s just another urban legend, right?

Garage door openers work with radio signals, which have nothing to do with sound. So, yes, urban legend (and a dumb one at that.)

I heard that Mariah Carey’s voice has been registered as a weapon of mass destruction and therefore is not allowed in Berkeley. Is this true?

I don’t know about Berkley, but she ain’t allowed within earshot of me!
Otherwise, I will go berserk and become a human weapon of mass destruction!

I waiting to see just how large she can expand her breasts. She must had had at least two “upgrades” over the past few years.

No, but Mary Hart, of Entertainment Tonight fame, has a voice that has been documented to set off seizures in at least one person.