Old Man Marley, 'Home Alone'
The first time we meet Old Man Marley (played by Robert Blossom), we see him as Kevin does: a haggard, Depression-era hobo ghost of an old man, dragging a garbage can full of salt and a shovel around the neighborhood all the live-long day. Mute and terrifying with murder in his eyes (and presumably his heart), legend (Buzz) tells Kevin that the garbage can is full of salt, for the purposes of preserving the dead body that he drags around with him for some reason.
Why Kevin believes his tarantula-owning, clearly-resentful-of-Kevin's-boy-next-door-good-looks cousin escapes us, but kids aren't super smart. Kevin spends most of the movie being terrified of Marley, seemingly moreso than he is of the Wet Bandits, who have invaded his home to do him bodily harm and flood his family's dated, country-style kitchen.
It isn't until Kevin seeks refuge in a church on Christmas Eve that he learns the truth about Salty McWrinkles. He's in the church too, probably because everything closes so early on Christmas, but also to watch his granddaughter's choir rehearsal. He's not allowed to see his granddaughter for some undisclosed reason, but nevermind that because Grandpas are never scary, so everything is pretty much fine.
In the end, good ol' Salty comes to the rescue with his trusty shovel, because after being set on fire, tarred and feathered and smashed in the face with paint cans, a whack from a common household item administered by an octogenarian is all it takes to take down the Wet Bandits.