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Opening a can without a can opener requires improvisation. One method involves rubbing the lid vigorously against a rough surface, such as concrete or a rock, to weaken the seal. Another option is to puncture the lid repeatedly with a sturdy knife or a pointed object like a screwdriver until it’s possible to pry it open. Alternatively, if you have a spoon, you can use its edge to slowly work around the lid’s perimeter, applying pressure to gradually loosen it. Persistence and caution are key to safely opening a can without a can opener in emergency situations.