Night of the Living Bread (1990)

"Well, things are pretty chaotic right now. But we are doing everything we can to maintain a sense of normalcy. In fact, we're about to give communion."
"Communion? Doesn't that involve the use of the holy wafer? A form of bread?"
-Fr. Bryne and Jeff Drexel.

Like Hardware Wars, this is a delightful short film about a movie that unexpectedly became a major part of pop culture. It was made by filmmaker Kevin O'Brien at Ohio University.
In this 8-minute parody of Night of the Living Dead (1968), people are inexplicably attacked by slices of bread. Like its namesake, this movie begins with Barbra (Katie Harris) and her brother Johnny (Steve Herminghausen) being attacked upon arriving at a cemetery.
Johnny is smothered by the bread before Barbra takes refuge in a house along with Ben (Vince Ware). They attempt to escape along with fellow refugees Tom (Robert J. Saunders) and Judy (Gina Saunders). This includes warding the bread off with toasters and bolting the windows with sandwich bags. They also watch TV to keep up to date on the situation, only to have the power go out after learning of communion wafers attacking people at a church which is being used as an emergency shelter.
Alas, bread in a lunch bag inside the house kills Tom and the ladies, leaving Ben the only survivor until the morning when he's covered with bread as he opens the front door.
I think it's safe to say that this spoof got George Romero's seal of approval as it can be found on some DVD editions of his classic zombie flick.
Fittingly, O'Brien acknowledges Romero and others involved with that film in the end credits.