Unknown 3million Naira Was Credited Into My Bank Account.

nairalander am rich i want to my bank account and i ask to check my balance it was credited with
3,500,000  that is 3million naira.o my God.am rich.
when the bank officer told me i told him he should check well,he said thats it.as a guy man i told him okkkkkkkkk   
okkkkkkkkkk  it has entered.thats what i said.


nairalanders do u think i should return the money?