Experience warns that … stuff … can happen.
My girlfriend is selling his car for a relative in a nursing home. She'll drive it an hour to a dealer near me, then I drive her home.
Me: "There's one thing you shouldn't forget."
Her: "Yes, the power of attorney. Got it."
"No, something else."
"The registration. It's in the glove compartment."
"Nope."
"Oh, right, the spare key. Good thing you mentioned it."
"No, not that."
'What?"
"Make sure you take his car, not yours."