I'm wearing a headset - got any good situational jokes?

So, I’m helping facilitate a big meeting with about 150 participants and about 20 staff. It’s bigger than what we normally do so a few of us have headsets so we can stay in contact. Does anyone have any good jokes to use, such as:

a) I played a phone message from one of the others over the speaker that totally confused the person who left the message in the first place, (what, what, who was that? huh?) pretty funny, pretty lame though.

b) You know, the deep voice, Barry White kind of sexy talk when the person can’t even smile because they are in front of a client.

c) ****** (really, really old joke deleted)

So, any other ideas?

Cheers, Powers

One of my old favorites: (possibly the one you deleted?)
At my old job we would carry two-way radios. If I ever got called while in the john, I would respond by holding the walkie-talkie as close to the toilet as possible & flush. Yup, reeaalll mature.