[Kathryn is vegan]
Laura: "I should spray some squirt cheese at you. We could fill a watergun with it."
Kathryn: "I'm sorry, I don't think that has any dairy products at all in it."
Jonathan: "You could always melt a block of cheddar and put that in a watergun."
Laura: "But then it would get hard."
Kathryn: "And that would destroy the watergun."
&c.