Wouldn't it be funny if malleability has confused MtGox about its own hot->cold->hot wallet transactions, and it really has way more coins than it knows? Then, when MtGox finally has someone with half a clue patch things & rescan, 700K BTC reappear, and they post on their homepage, "Nevvvvvermind – it was all a bad dream."
When I was a teenager, like many teenagers, I liked to drink. Unfortunately for me, my father disapproved of teenagers drinking; perhaps once every week or two he would count all of his beer bottles to ensure that I was not sneaking any. There were gaps in his accounting, but I never knew exactly when he would account for them.
What was I to do? I devised a simple scheme:
1) Steal a bottle of beer.
2) Drink i^W^W no no, hide it. Hide it in the back of the fridge, or in the pantry.
3) Wait two weeks. [If during step 3 the absence of the beer was discovered, goto step 3a. Otherwise goto step 4]
3a) "What are you talking about Pops, your beer is right here behind the radishes." [goto step 1]
4) Glug glug glug.