At meetings that I think are a waste of time, I retaliate by wasting even more time over meeting agenda minutiae, or by asking to go over minutes of old meetings.
@fesshole As a contractor I would say "do you really want to pay me ยฃxx/hr to sit in this meeting?" and usually got the answer "no".
One of my council colleagues once dealt with a meeting that shouldn't have been called by saying "there's nothing on this agenda that couldn't have been held over until next time, the meeting should have been cancelled" and walking out, thus rendering the meeting inquorate, so we all had to go home.

