I'm a little confused. Did the 41 cent thing show up on the receipt as given to you while physically in the bar, or was it a charge that came up on your online statement a day or two after? If it's the latter, it's standard practice to preauthorize the card to make sure it can cover the eventual bill, with the proper charges (with gratuity added in) only showing in full days after. How many drinks did you get and how much did you tip? At least based on the bar I work at, $50 seems pretty much in line with how much a round or two (depending on the number of people) would cost for premium drinks at $6-8 a pop, with a 15-20% tip counted in (e.g. 49 = 7 drinks at $6 each plus a $7 tip). Your post also suggests that you agree that the charge seems appropriate. So why would you want to dispute a charge that seems to be in line with what you purchased? Basically, if it really, really concerns you (and I don't think it should from how I've interpreted your comments), you might find it worthwhile to stop by during the day and just ask a manager if it would be possible to see an itemized receipt for your tab because you were confused about how it showed up on your card. If it's at least a decently organized bar, it should be possible, albeit time-consuming, to pull at least your total authorized bill from old records. However, definitely don't show up with an accusatory attitude or come out asking for the charges to be removed. That will instantly lump you with the many people trying to scam free stuff, and possibly put you on a shitlist of sorts if you plan on being a regular at that bar.