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The universal principle behind every method: you need a rigid edge to act as a fulcrum under the lip of the cap, then leverage to pry it up. Almost any hard object with a suitable edge will work — a lighter, a spoon, a key, a countertop, or a second bottle.
The technique that underlies most of them:
Method 1 — A lighter (the classic)
Hold the bottle neck with your thumb pressed against the cap. Slide the bottom edge of the lighter under the cap's lip, resting it across your index finger. Press the far end of the lighter down sharply. The knuckle does the work, not your grip.
Method 2 — A spoon, fork, or butter knife
Slide the tip under the cap edge and lever upward. A spoon handle is sturdier than the bowl. Work around the cap in two or three spots if it doesn't come off at once.
Method 3 — Another bottle
Turn a second (unopened) bottle upside down and hook the edge of its cap under the edge of the first bottle's cap, then lever down. It works surprisingly well, and you can then open the second with a third — or a different method.
Method 4 — A countertop, table edge, or railing
Place the cap's edge against a hard, square edge with the cap resting on it, then strike the top of the cap sharply with your palm. It works well but will damage most surfaces, so use something you don't care about — a scaffold pole, a concrete ledge, a fence post — not a kitchen worktop.
Method 5 — A key
Wedge a sturdy key under the cap's lip and lever up, rotating the bottle and repeating around the edge until the cap loosens and lifts.
Method 6 — A belt buckle
Hook the buckle's prong or frame under the cap and pull the bottle down against it.
Method 7 — A ring
A solid metal ring on your finger can catch the cap edge. Grip the bottle neck, hook the ring under the lip, and twist your hand upward. Be aware this can bend or scratch the ring.
Method 8 — Scissors or pliers
Pliers are the easiest of all: clamp the cap and twist. With scissors, wedge one blade under the lip and lever — do this carefully and slowly.
Method 9 — A door strike plate
The metal plate in a door frame usually has a lip. Hook the cap under it and pull down.
Method 10 — A dollar bill (the party trick)
Fold a banknote in half repeatedly until it's a stiff, thin wedge, then fold that in half to form a rigid V. Use the folded edge like a lighter. It genuinely works, though it takes a firm grip and some practice.
Safety notes:
And a genuinely useful tip: a carabiner, most multi-tools, many key fobs, and even a sturdy metal spatula all have edges designed or well-suited to the job.