A friend of mine teaches 3rd grade and has a Sponge Bob theme in her room (I'm not a SB fan, but it works for her). She asked me to create some new materials for her room. One of the things I created were these little hamburger/crabby patties. I also made a large sign that says, "Over _______ Book Read." The students fill out a crabby patty each time they complete a book or read over 100 pages. Throughout the week the crabby patties will be collected. At the end of week 1 lucky patty is drawn at random and they receive a prize. Then all the crabby patties are counted and the sign updated. If they hit their class goal (not sure what it is) they receive an extra recess or game play time.