I'm a great fan of the speech recognition software on my Blackberry Pearl but (lack of) sensitivity problems with a replacement Bluetooth headset of different make to it's excellent predecessor (that I had left on the roof of the car and then driven off...) lead to the idea for a game when I was a bored passenger one day.
Instead of "Call Fred Bloggs Home" or "Call Aunty Mabel Mobile" try "Call the F*ck Ugly One" or "Call The Twit".
The resultant "Did you say call XYZ?" was often hilarious!