So far, so good with the substitute teaching. As long as you let the kids know you're in charge from the get go, you can have a pretty good handle on them. Every now and then a kid will feel the need to test you. Mostly the reaction to a substitute is "Well, they're not going to be here tomorrow, I'll never see them again, I can do what I want." But if you squash that pretty quick it makes for a good day.
I've also found that if they finish whatever work the teacher had for them, instead of letting them chat away (as the noise level increases) I get their attention and engage in some current event talk, whether it be about the election, or hurricanes, 9/11, or what have you.
I asked a class the other day what grade they were in when 9/11 happened, and I was told the 2nd grade!!!!!!!!!!!!!!!!!!!
I also asked the class what year they thought I graduated, and one girl said "1989!" Now, no offense to anyone that graduated in 89, but I graduated in 2003!!!!! And I barely look that old, so I'm not sure where she came up with that one