Repeat after me:
Buckle my shoe.
Kick at the door;
Pick up sticks;
Close the gate.
- One, two, buckle my shoe - ankle jerk : S1-2
- Three, four, kick at the door - patellar tendon : L3-4
- Five, six, pick up sticks - biceps/brachioradialis : C5-6
- Seven, eight, close the gate - triceps: C7-8
Ok, it's pretty much those nerve roots. Some people include expand the list a little; for instance, triceps can be said to test C6, C7 and C8, instead of the latter two. But still...