Indeed. A humorous version.
When I was in the USAF in D.C., one Saturday morning a guy woke me up with "I'll give 6 for 5 till payday" (payday being 3 days away). Still half asleep, I muttered, "Huh." "7 for 5!" "Huh"; "8 for 5" "(finally awake) Sure!" I think that's an annual interest rate of close to 400%.
Carrol