The body with string and clothes - suicide? Accident? Murder?
(Three questions in one)
Accident.
Thinks a moment
If it helps, here’s a hint: It was raining.
OOOOH! I think I’ve got it! (nice, nice, nice hint)
Was he flying a kite, and it was struck by lightening?
Ohhhhhh! You mean that OTHER guy who died with the string and cloth lying next to him! I knew him too! He was flying his kite when it started raining, the string got wet and conducted the current that elctocuted him when he flew it into the high-tension lines. Tragic. Absolutely tragic.
Damn you touch typers and broadband users! 
Mersavets got the one I’m familiar with, but SirJamesp’s answer is valid, too. Congrats!
Joe walks into a bar. He asks the bartender for a glass of water. Instead of giving him the water, the bartender reaches under the bar, pulls out a gun, and points it at Joe.
Joe says, ‘Thanks!’ And leaves the bar.
What just happened?
L
Joe had hiccups. He asked for a glass of water for his hiccups, but the quick thinking bartender instead pulled a gun which frightened Joe’s hiccups away.
Dang you got that fast! If I had a prize, I’d give it to you.
L
My brain only moves laterally, when it moves at all. Only been stumped by a couple so far. Do you know some more, because I don’t know any like these? Maybe I’ll make up one later today while I’m supposed to be thinking for pay.
I have an old one that will be quite difficult if nobody has heard it before. I guess the turn defaults back to SexyWriter, but if she wants to pass to me…
Probably the first one I ever heard:
Romeo and Juliet lie dying in a puddle of water in front of an open window…
Solve.
Gp
Romeo and Juliet are goldfish. The wind from the open window knocked their bowl over.
Two people are in a room. One looks out of the window and realizes he is about to die.
Only the one?
They are in the gas chamber and the condemned man sees the warden give the signal to the doctor to leave the chamber so the sentence can be carried out?
Yes, only one is about to die. Mers, very nice try. 
As he looks out of the window, he sees in the glass the reflection of the other man approaching him from behind with a gun pointed at his head.
grim, that’s close. Here’s a hint, when the man who is about to die looks out the window, the entire room can be seen in the reflection of the window.
He cannot see the witnesses to the execution because of the 1-way glass-- it’s a mirror.