Me: We need to throw that coffee cup away.
SH: What? No! Why?
Me: Because it leaks. That crack down the side has finally opened. I don't think it can be fixed.
Me: But it's useless!
SH: I want to keep it.
SH: Because it's a souvenir from when I worked at [Silicon Valley startup #2,641 that didn't make any of its employees rich]
Me: Ah. That's a good reason.
He can put it with his employee manual from when he worked at Apple over 20 years ago, the phone bills from 1997 when he was still married to his ex, and those expired coupons for Culver's.