I will say "Thanks Obama" ironically, recalling the Souls mod that replaces "You died" with that phrase. It's like shorthand for "that couldn't have been my fault despite the fact it couldn't possibly have been anyone else's". Especially funny when it goes over the head of more conservative folks.
This is an extremely weird/niche one, but any time I think something is too pricey, I will say "Someday, perhaps, when I'm rich" in the voice of the male Crusader character from Diablo 3. I love that game, but I do not know why that line stuck