I'm a comedy junkie and when I heard these two crank call clips done by one of my favorite comedienne's, Wanda Sykes, I had to tell you and your mom about it. I believe you'll hear both of these in a future episode of Crank Yankers on Comedy Central sooner or later. [Clips found via Ian and Davezilla, you two kick ass]
I can't say if one is more funny than the other but you'll laugh nonetheless: TowYardComplaint.mp3, she makes a complaint to a Tow Truck Company that one of their employees left a "surprise" in her car's backseat. conjugal_visit.mp3, she inquires about a conjugal visit at the jailhouse, but I won't spoil it for you.
I really enjoy Wanda Syke's comedy. Her jokes all come from her life, experiences, and things that are happening in her environment that she can make good humor out of. She'd be a great guest on "Who's Line is it Anyway?" because she's got quick wit and very clever at improvising, but the content of some of her humor may not be totally suitable for a general audience that Who's Line caters to. No jokes that are too sexual, but she can talk about nasty things with a straight face that would make you cringe at. Then again, her level is somewhat at the level of Ryan Stiles, and he sneaks in quite a few sexual jokes in the show that make me wonder how he gets away with it from the censors and the people who edit each show.