Kill-a-Half-Hour Question

Thursday 1/30: More than 10 BILLION of these are purchased every year, but it’s likely the last time you got them, they were free.  What?
Thursday 1/30: More than 10 BILLION of these are purchased every year, but it’s likely the last time you got them, they were free. What?

Clues:  “Fast food” and “Condiment”
Answer: Ketchup packets.