Student Assignment 1: Who vs. Whom

There has been a raging war between who vs. whom for quite some time now.
Ultimately, "who" is a subjective pronoun, which means that it acts as the subject in a sentence.
Ex. Who won the race yesterday? He won the race [that is who].

"Whom," the archenemy of every high school English student, is an objective pronoun, which means that it acts as the object in a sentence.
Ex. There are many students with whom Jen has connections.
Rephrased: Jenny has connections with them [the many students].*

*In most grammatical situations, a preposition is paired with whom ("for whom," "with whom," "by whom," "to whom" etc.), but there are exceptions to those situations as well.

What examples of the use of "who vs. whom" have you come in contact with?
Post an example for the class to discuss.