Well.... I've gotta be known for something...
May as well be the jerk who posted a joke about an event 2 1/2 weeks after the event.. 
Remember... humor is a valid way of coping with tragedy..
That said, warning, do not read the rest of this post if you're sensitive about jokes...
And also, I don't mean to diminish the horror of the event... it was a terrible tragedy.
That said, you've been warned.  On with the tasteless jokes (gathered from a google search)
*Two sharks having a conversation*
1st shark. Do you fancy a takeout tonight?
2nd shark. Okay, shall we have Thai or Indian! 
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Santa was that busy this year, he could not go over to people in South Asia. So when he went past he just gave them a massive wave!
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What is the new fave drink in Sri Lanka?
mudslide.
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you hear they have cancelled the elections in sri lanka?
too many floating voters
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heard of the latest dieting craze sweeping asia? swim fast
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Helen MacArthur has ended her attempt to be the fastest around the globe single handed. She gave up when she was overtaken by an Indonesian on a deck chair
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how do you get out of paying for a meal ,in an indian restaurant?
waiter,waiter there's a deck chair in my soup!!
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Some people are so politically correct about the Tsunami tragedy, the local supermakets are already removing from the shelves all the boxes of TIDE and SURF
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The Gold Coast Surf Classic produced a sensation when the top ride of the day went to an Indonesian on a wardrobe.
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edit: added one that I removed from below.