My bank lies to me all the time. I deposit a cheque, and it puts the funds in my bank. Once it decided I was trustworthy, it even let me spend the money right a

My bank lies to me all the time. I deposit a cheque, and it puts the funds in my bank. Once it decided I was trustworthy, it even let me spend the money right away. It turns out, though, that it might take _weeks_ for the cheque to clear, and they reserve the right to reverse the deposit and ding me for an NSF fee at any time. Users often prefer optimistic processes to ACID trips.