A woman dies and goes to heaven.
Later, Peter says "I have to run an errand, can you just stand at the pearly gates for an hour or two to greet new arrivals til I get back, but don't let anybody in unless they can spell 'London'"
So she stands there greeting them, asks them to spell 'London' (which of course they can easily do) and waves them inside.
Then she's surprised to see her hub turn up because he was in perfect health the last time she saw him on earth.
"Well" he explains, "I spent your life insurance money on one long orgy with hundreds of women and my poor heart gave out, I hope you're not mad at me.
Now let me inside will you.."
"Sure" she replies, "just spell 'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch'"
http://en.wikipedia.org/wiki/Llanfairpwl...ay_station