Hey, you’ve got five seconds. Marilyn’s just gonna get in one good slap. Me, I figure it’s worth it. 
(TR, though… nah.)
Me, I’d rather go through history giving pies to the face.
Dan Rather on October 5, 1986 (the day after the attack that inspired the well-known R.E.M. song). Five seconds should be enough to belt out “Kenneth, what is the frequency?” Freak his ass right out.
Well, he did carry a bick stick.
I like your style!
And what am I supposed to do with my other fist?
You’re asking the internet?
What would happen if I went back in time and punched myself right before I went back in time to punch myself?
Can we wear what we want, for the trip?
In one special case, that of President Kennedy, I might just delicately balance a jelly donut on his head at the critical moment.
…or, y’know, punch Houdini in the face a moment before the kid could suckerpunch his appendix…
Mohammed Atta. It’s recent enough that all my kids have been born, so I’m not screwing up my past at all.
And maybe that somehow detains him enough to miss his flight, and 9/11 is not as bad, and Bush doesn’t get reelected, and…
Whoever thought up the Knockout Game. (The* real* irony is that it was my Dad who invented the game and that’s how he met my Mom!)
Ever think about how he got the idea for the game?
The Place: Deepest Africa
The Time: Circa 500 BC
After a hard days hunting a group of men are sitting around the campfire on a pleasant evening, relaxing and chewing the fat.
Suddenly there is a flash of blue light and a strange pale looking dude wearing odd clothing appears in the camp, he looks quickly around, steps forward and whacks poor old inoffensive Bob who falls backwards off his log, legs splayed in the air. Another flash of blue light and suddenly the apparition is gone, leaving a general expression of ‘o_O’ in the camp, one of the men careful sets his ‘special’ leaves to the side…
What can I say, the idea just amuses me…
No. Why?
Besides, he told me he borrowed the idea from my Uncle Sanchez’ game called ‘Mule Punch,’ which, unfortunately, never got all that popular.
Well, really you could just do that right now, without the need for all the mucking about with time travel.