if you see discount after you buy something what will u do?

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suppose if you bought something yesterday and see thet it has 20% discount today....what will you do?...do you think it is fair to ask the store to give you the discount? just a little incident happend with my dads friend ...he went to a shop to buy a pot it was say $13 he didn't think it was worth so he didn't take it...next day he saw an ad for discount from the same shop...he went again to check for it and to get it with a discount...it was something shocking...the price for that pot was $13 after discount... if he had not been there before he would have buyed it saying its good for the price as its a discount...but because he had been there a day before he knew the actual prize... he came back and told my dad about it...and i just shared it with you all...the story of discount.