They can act!!

One thing I hate when children grow up learning to read out loud without expression.  And when they get to to be adults, they're stuck expressionless. 

So...why not set up a theater in YOUR classroom (or if you can, use the auditorium)?!  Get out those props, costumes, and have them do a play and make them use EXPRESSION!!  No one wants to go to play where the actors have no sense of voice.  At least I don't!  If you don't wanna go through the trouble of having props, costumes, and lots of movement, then just read the play out loud with (but don't forget to make them use:  expression, Expression, EXPRESSION!).