21.   Bush is not the only one in the race to use self-deprecating humor, though.

22.   But he uses needling humor to ride herd on lawyers.

23.   But humor can be used just as effectively in a positive ad, explains Democratic media consultant Saul Shorr, of the D.C.-based firm Shorr Associates.

24.   But rather than offering instruction in workplace joke-telling, he advises audiences to be careful in using humor.

25.   But they still made an impact because of their ability to use humor to cut through the brambles of self-righteousness.

26.   Fifth, use humor when you can.

27.   He can tease about race -- using humor with an edge to unsettle.

28.   He has practical tips on dating, courtship and marriage, using humor along the way.

29.   He recommends that businesspeople not feel obliged to tell jokes, but rather use humor to illustrate a point and make the audience more willing to listen.