Funny you should prop-ose that...

Fellow speaker,

If you are using a prop for humor, make sure it's a big prop. Note how Hans Rosling displays his "ecological recyclable pointer":
http://youtu.be/fiK5-oAaeUs?t=5m6s

Pointedly,

Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com