A: I'm gaining weight.
B: How much have you gained?
A: Three pounds just this month.
B: Do you know why?
A: I think it's the ice cream.
B: You started eating ice cream?
A: It was on sale.
B: How much did you buy?
A: I filled up my freezer with ice cream.
B: Well, it won't last forever.
A: No, I figure I'll finish it all by next week.
B: Then you can start losing weight, if there isn't another sale.