Don’t bite the hand that . . . looks dirty.

As said by a student: Don’t bite the hand that . . . looks dirty.
Original quotes is: Don't bite the hand that feeds you.

You can lead a horse to water but . . . how?

Said by an elementary student: You can lead a horse to water but . . . how?
Original quotes is: You can lead a horse to water but you can't make it drink.

Better to be safe than . . . hit a teacher.

 Said by an elementary student. "Better to be safe than . . .hit a teacher."
Original quotes is: Better to be safe than sorry.