[Bath & Body Works]
Me: I need a bottle of body lotion for my wife.
Clerk: These are Buy 3 Get 1 Free.
Me: I just need this one here.
Clerk: That's not Buy 3 Get 1 but it IS Buy 1 Get 2 and if you buy this it's Buy 2 Get 3 Free.
Me [leaving with 300 bottles]: how did this happen