In 2008 CapitalOne offered me a perk on my No Hassle Rewards credit card - the choices were more points per dollar, a lower interest rate, or a higher credit line. I already had the most points and the lowest rate they could offer, so I told them more credit please. They said they would raise my limit by $1,500 (my limit at the time was probably about $4,500). A week later I logged into my online account expecting a $6k limit, and I found a $19,500 limit. I guess she added a zero lol.... I still have the card and they never took back the increase.