Options include:
During a fight to the death with someone I've been plotting against for years: 'I win.'
In some manner of freak accident: 'Oh no, not again.'
Slowly in the arms of a loved one: 'When I die, make me a penguin. I like penguins.'
'Stage two, complete. Beginning stage three...'
'Friggin' finally...'
'Beware... the Marmoset...'
'Death? No! My one weakness!'
[Say nothing, but grin as wide as you can manage and optionally wink at a random person nearby.]
'Aw, c'mon, I call do-over!'
'Ooh ooh, now what?'
'well, gosh.'
'I suppose there's only one person left who knows...'
'Let's try this again, shall we?'
'Ia, Ia, Cthulhu Fhtagn!'
Neotericity said:
"The gold is buried by the oak tree directly under the..."
You win.
Credit also goes to "Yes, just three."