Gun control certainly isn't something to joke about, neither is the assassination of a presidential nominee. And yet Mike Huckabee did both today while addressing the NRA.
From CNN:
During a speech before the National Rifle Association convention Friday afternoon in Louisville, Kentucky, former Republican presidential candidate Mike Huckabee — who has endorsed presumptive GOP nominee John McCain — joked that an unexpected offstage noise was Democrat Barack Obama looking to avoid a gunman.
“That was Barack Obama, he just tripped off a chair, he's getting ready to speak,” said the former Arkansas governor, to audience laughter. “Somebody aimed a gun at him and he dove for the floor.”
Obama supports extending the assault weapons ban, limits on gun sales, and a national law against carrying concealed weapons, with exceptions for retired police and military personnel. John McCain – whose legislative record was awarded a C+ rating by the NRA in 2004, but has received a perfect score – will address the group later Friday afternoon.


I have looked at the part of this film clip when this "incident" occured at least twenty times. While most,if not all speakers would ignore the single low noise occurence, Huckabee turns almost simultaneously(on cue?) as the noise is heard - as though he was expecting it...
Try it. Keep doing a replay at that "spot" on the clip and it does seem strange.