Take the punchline from the previous post, and provide the set-up for it.
Then make up another punchline for the next poster.
(Your punch doesn't need to work with your own set-up too, that would be too restrictive)
I'll kick off with a punch:
"To get to the other side."
But I already do a Punch thread. 
Quote: Hercules Grytpype Thynne @ 4th December 2015, 7:21 AM GMTBut I already do a Punch thread.
Not sure how your first sentence fits my punch, but I'll do a set-up for your punchine of " "
What face does Herc do dealing with the needs of sailors?
Let's start again:
"To get to the other side."
Quote: Nogget @ 4th December 2015, 8:03 AM GMTNot sure how your first sentence fits my punch, but I'll do a set-up for your punchine of "
What face does Herc do dealing with the needs of sailors?
Hey Bennett, I'll come over there to yodel land and punch(heh) yer lights out.
Quote: Hercules Grytpype Thynne @ 4th December 2015, 9:17 AM GMTHey Bennett, I'll come over there to yodel land and punch(heh) yer lights out.
Yes, go on, hit the innocent bystander, not the one that made the nasty joke.
Quote: Gordon Bennett @ 4th December 2015, 9:01 PM GMTYes, go on, hit the innocent bystander, not the one that made the nasty joke.
You guffawed, that's enough for a biff. 
Ok I'll go Nogget
Why did the terminally ill patient heading for the Dignitas Clinique cross the North Sea?
New Punch -
"Because it was happy hour."