Take a drinking straw cut it in half. Raise your thumb while curling your bottom two fingers back, leaving trigger and middle finger outstretched vertical and touching (No gap).

Place the straw against your fingers, just in front of your knuckles. Hold the straw very gently against your fingers for a few seconds with the thumb of the other hand; then try reducing the pressure of the thumb a little. You can use the inside or outside of the fingers. It's possible to lift 12 straws.

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A similar, yet more powerful 'force' effect is noted in Salamanders. Their ability to adhere to vertical surfaces and limb regeneration is attributed to Electromagnetism. [The Body Electric: Electromagnetism and the Foundation of Life, Dr Robert O. Becker]