Most days he's not even quite sure of the next stop on his frenetic travel schedule.
The police chief in Dubai has said he is 99% sure of Israeli involvement.
Still, at any given point, Wikipedia visitors can't be sure of what they're getting.
Joe Garner made sure of the win after a sloppy bit of play from Didi Hamann.
Just like Circuit City, the company became complacent and a bit too-sure of itself.
Helm said she wasn't sure of the relationship between the boy and the Fannings.
The two of them were happy, content, sure of themselves, on top of their game.
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But Steenson made sure of victory to deny Newcastle a bonus point with three successful kicks.
In fact, I'm sure of it because all six of them walked me to my car.
And the one thing I'm sure of is that this is not Japan in the 1990s.
On both occasions Barkley took advantage to kick penalties and make sure of England's victory.
Although now plainly well placed to win the presidency, the Colonel cannot be sure of it.
They are so sure of their one-size-fits-all advice that no testing or validating is required.
That means it is possible to be sure of the paternity of a tadpole.
Chelsea must beat Cluj in their last group game to be sure of qualifying.
As ever, they want a vote only if they can be sure of winning it.
In contrast, enough is known of Shapley, her last boss, to be sure of his egotism.
At this stage no one can be sure of their calibre, nor of their political loyalties.
Mr Patterson, though his party heads the opinion polls, cannot be so sure of winning.
Book well ahead for July and August in order to be sure of getting on a cruise.
Tries from Anthony Blackwood, Lincoln Withers and Matt Smith made sure of the victory at Brewery Field.
What we've got to make sure of is that we don't have a lot of bad games.
Stevenage arrived at Kidderminster knowing victory would make sure of the Blue Square Premier title and promotion.
But the methodology and sample size are such that you can't be too sure of the Scottish figure.
"As to where he's best, I'm not sure anybody's completely sure of that, " McBryde told BBC Sport Wales.
You'll shatter the Republican base and not replace it with anything or not be sure of replacing it.
She had overcome extreme shyness and had become very sure of herself without ever losing her human touch.
Volunteers are never sure of the conditions they might face when deployed to disaster sites or developing countries.
Larsson is sure of his place and is looking forward to again felling one of the tournament favourites.
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