Anyone who's anyone knows that when you're in the United States you tip at least 15 to 20 per cent of your bill when in a restaurant or bar.
If you've seen Reservoir Dogs, you will know how important tipping is to people in the US service industry, which is notorious for paying employees low wages.
Therefore tipping is incredibly important in those jobs, so not tipping or tipping below the acceptable limit is a big no-no.
Someone really should have told this to CNBC before they shared this video which attempts to give financial advice on how to tip and save money.
The problem is that while the video encourages everyone to tip, it actually tells viewers to tip less money and essentially short change the hard-working members of the service industry.
The video, which was shared on CNBC's Twitter account on Monday, has been viewed more than 5 million times, but an overwhelming number of the comments are critical of the behaviour the video is promoting.
God bless the woman at the end of the video who called this scheme out for its selfishness.