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Escape Artist
Thanks David

candles
Answer :
He lies the candle on its side and lights both ends.
It takes exactly 30 minutes for the two flames meet in the middle.

AI response

 He lights the candle with his lighter.
This starts the 1 hour timer of the candle burning down.
He then lights the candle at the other end as well, so it is burning at both ends.
Since the candle was made to burn for 1 hour from one end, when lit at both ends it will only take half the time - 30 minutes - to fully burn.
After 30 minutes have passed with the dual-lit candle, half of it will be burned up.
At that moment, the Great WhoDeanie can walk out of the room, having timed 30 minutes exactly.
So by cleverly lighting both ends of the one hour candle, the Great WhoDeanie divides the burning time in half by having two flame fronts.
When the candle is half burned through, 30 minutes have passed.

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