when the kids do things like
**Sticking the tongue out.
**Pulling their hair.
**making water bubbles through mouth
**putting fingers, at times even whole hand into the mouth.
Gently remind them for a while not to do it, if the frequency increases, just understand they are doing it just to get your attention, so just ignore it and they will get right on their own.
However, with thumb sucking it is a different thing altogether. If it is something which has started suddenly after 3 months or so, then see if the kid is feeling some insecurity or anxiety, too many changes in lifestyle, just missing you more or any other reason you could figure out, spend some more quality time with the kid, assure that you are there for them through soothing words, etc. and most of the times, they do stop.
Do not make a big issue of it, shout, scold, lose patience at any point, especially with regard to new behaviors. Be a bit stern in the voice, ignore it and let them know clearly that they will not be having any attention from you for such a thing which is actually not really acceptable and things will be just fine.
But then again, it is my personal experience and not an expert suggestion, try this and hope for the best :).
Also, for things like pulling out your/some one's else's hair, just let them know it is not acceptable through your acts.. maybe even pull her/his hair a bit stronger and let the kid feel the pain, to a lesser degree though. Tell them that it really hurts you, talk to them and they actually understand that. I find it useful in 2 ways, teaching them concern for another individual and knowing right from wrong.
Try and let me know if it actually worked for you.. Happy Parenting!