The key to successful science is preparation and a good anticipatory set. 

Missions

Every time I have an experiment or something the students will need to do in science class, I type it up as Mission.  I place this folded piece of paper on the board.  Eventually, the students start looking at the board first thing in the morning to see if we have a mission to accomplish.

Here is a typical example:

• Lesson: Learning that plants contain water and the concepts of evaporation and dehydration.  
• Mission Impossible music plays.  I dramatically read the following statement...Bugs Bunny is furious with Elmer Fudd.  He believes Elmer is stealing his carrots.  Bugs weighs his carrots once a day and for the past two days the weight has decreased.  Your mission, if you choose to accept it, is to gather evidence to support Bugs or Elmer in their argument.  Do you accept this mission?
• Class shouts, "Yes," and then I tell them the procedure.  Basically, they weigh sliced carrots for 3 consecutive days.  Make a graph.  Discuss their findings.

Favorite Lessons

This section will just contain my students' favorite science lessons.  I couldn't possibly include them all, but this should be a good start to spruce up your own science program.