> the credit card company I use for dining will notify me via email if they think there has been an exorbitant tip outside of 45% or so I once left a 100% tip

> the credit card company I use for dining will notify me via email if they think there has been an exorbitant tip outside of 45% or so I once left a 100% tip and my CC company straight-up blocked the transaction. I get it, and that's certainly the safest response, but it was very embarrassing. Now that I think of it, that was when I started tipping in cash.