I think teaching conditionals offers good opportunities to sneak in some learning about syntax if you introduce it right. Having students raise their hands and think of "If x, then y" statements gets the entire class involved, and makes sure the students know that conditionals rely on much on form as they do content. I feel like nested conditionals could be a tricky nut to crack, but lots of nested conditionals pop up in everyday life, and especially in games. With the older students, fouls in games offer a great chance to learn about nested conditionals. There are some circumstances when it's okay to rush a quarterback in American football, or stand in the key in basketball.
Of course, however, it's best to start simple, and I really enjoyed the basic
format used in the example. Small rewards and participation are wonderful ways to introduce topics.