There are several effective ways to open a wine bottle without a corkscrew. Here are some popular methods:

1. Screw and Hammer Method: Use a long screw, a screwdriver, and a hammer. Screw the screw into the cork leaving enough space, then use the hammer to pull the cork out.
2. Heat the Cork Out: Use a lighter or kitchen torch to heat the air just below the cork. The heat expands the air, pushing the cork out. Be cautious with this method.
3. Push the Cork In: Use a blunt object like a knife butt, spoon, or pen to push the cork into the bottle. Note that the cork will remain inside the bottle.
4. Key Method: Insert a key at a 45-degree angle into the cork, twist, and pull it out slowly.
5. Shoe Method: Place the bottom of the wine bottle inside a shoe, then gently tap the shoe against a wall. The pressure helps push the cork out gradually.
6. Knife or Scissors: Carefully insert a serrated knife or one blade of scissors into the cork, twist and pull it out gently.

Each method has its pros and cons, so care should be taken to avoid breaking the cork or bottle, or causing injury.