Just pretend you're not paying attention. Stare at the wall, tap your pen on the table, and mutter something about "uh-huh" when someone talks to you.
This technique is 100% effective in meetings where the discussion is dull and uninspired. It's like a free pass to the "I'm not here" club.
But beware: if the meeting leader is also using this method, things might get awkward.
Next Solution: The "I'm Not Listening, But I'm Taking Notes" Method