We used to let the parrots talk to telemarketers. Nothing funnier than a bird repeating "Hello" over and over again and a telemarketer doing the same.
I don't usually answer my phones.. except my work phone (because I have too). I figure if it's important they'll leave a message.. if not then they didn't really want to talk to me anyway.
I hate when people let the message get all the way through and THEN hang up so theres only a dialtone on the voicemail/machine. I guess thats better than the people who call and do the "it's just me, just wanted to hear your voice" messages multiple times a day. 