Just fill 'em with water

"His footprints in the sand can never be filled."

Works for me

Person #1: "The airfare to Paris was high until the bombings happened."
Parson #2: "So there's an upside to terrorism."

There's a difference?

Patron: "I'll have a pint of ale."

Bartender: "Do you want a large pint or a small pint?"