how to open a can without a can opener requires ingenuity. One method involves using a sturdy knife or spoon to puncture the lid repeatedly until it's weak enough to pry open. Alternatively, rubbing the top of the can against a rough surface like concrete or pavement can wear down the lid's edge. Be cautious to avoid injury, and remember that these methods may not always be effective or safe. In emergencies, seeking out tools like a flathead screwdriver or even a rock to leverage the lid may offer a solution. Always prioritise safety and proceed with caution when attempting unconventional methods.