Saying "cheers" and/or clinking glasses - because, apparently this was drinking to the gods/the dead.
Saying "lucky" - "fortunate" was ok... even though fortune is the same thing.
Yoga - because according to Watchtower a demon would pop into your head.
Hypnosis - same reason as above. And Watchtower foolishly printed that the hypnotist has "control of your mind" which is totally not the case.
2nd hand items - because, apparently, demons like to live in vases and 2nd hand trousers.