Tickld provides 25 great 2 line jokes including some of my favorites:
4. How many Germans does it take to screw in a light bulb?
One, they're efficient and not very funny...
8. Apparently, someone in London gets stabbed every 52 seconds.
14. Want to hear a word I just made up?
21. Someone stole my mood ring,
I don't know how I feel about that.
22. I tried to catch fog yesterday,
25. I told my wife she was drawing her eyebrows too high.
She looked surprised.
See them all at The 25 Best Two-Line Jokes Ever. #15 Is Priceless.