Week 1 - Students are a fruit salad

My advanced calculus class of students is a fruit salad of experiences.  I have sophomores through seniors who have taken no proofs classes through either our abstract algebra course or our introduction to proofs class.  Why do I think of this as a fruit salad?  Because they are all different flavors and textures, but are all welcome in the class.  I have one banana who is pretty sure he is in over his head, but having had him in other classes, I know he is capable.