well if she starts nagging constantly and blabbering about things you have no idea about!!!!!!:fid:
oh wait thats my wife!! sorry,.......LOL..
personally the only sure sign of stress i know is delayed growth, if your plant hasnt grown much in a week its definitely into shock..
as far as what shocks them, well that pretty much becomes common sense after you read the grow guides, i could probably name a hundred things now and some one else name an extra 100 so theres no clear answer.. just do some reading my friend.. and you will come out with a lot more knowledge than questions..Good Luck