it was a joke, but actually it is common in forex. never negative, but occasionally positiveQuote from TheGoonior:
How do you get slippage on a limit order?
I want to sell at the bid, and you want to buy at the ask, and the ECN just splits it, and we each get a little positive slippage
otherwise, when it comes to ES, it was just a joke, like hopefully this whole thread is.
but to reiterate, positive slippage on a limit order in forex is not normal, but then again it is not uncommon.