Having perfect pitch is annoying when you replace the batteries in your doorbell and then it rings almost a half step sharp. I liked it so much better when it rang D to B-flat. Hrmph.
Having perfect pitch is fun when you're waiting for the MUNI in San Francisco listening to the "inbound" and "outbound" chimes: D down to A for outbound, and D up to F-sharp for inbound. Or was it the other way around? Either way, it always got the 3rd movement of the Beethoven Violin Concerto in my head.