Yep, I still do some of this too- especially with some of the later series where I get a bit caught up in the atmosphere.
When I know what's about to happen tho., I do now sometimes amuse myself by shouting at them to do the wrong thing. "Go on, take the dagger, not the horn. Don't listen to Brangwen, she knows nothing." Oh, and of course, "Go on, take the empty jar of humbugs- Lillith will just love that".