From my brother-in-law:
"The Hyatt in San Diego that I just checked into brilliantly decided that
they'd use the same button for "Hand Volume" and "Emergency". I.e., you pick
up the phone and want to boost the handset volume, and instead you get
their emergency number. The guy there said Oh You Have To Push It After
You've Dialed, d'oh .... except I tried that just now and it didn't work
Harumph. Where's the local ADA pitbull lawyer?"
(answers gratefully accepted at email@example.com)