"Top 10 Reasons For Being" joke

Top 10 Reasons For Being Irish
The Guinness is great
The crack is great
You won't get in a crack unless you marry them
You can't have sex with a condom on
Thus you must have sex without one on
No one can ever remember the night before
If you don't agree with me I'll blow you up
The stew is great
The Murphy's is great
Er...Best pop down the pub and have a think