(I) told you (so)

I warned you that this would happen; I told you things would turn out this way. A: "That car I bought online turned out to be a complete piece of junk!" B: "See? I told you!" A: "Oh no, the game I downloaded had a virus in it!" B: "Told you! Next time, don't go downloading free games off shady websites!" A: "That thing is going to break if you keep twisting it like that!" B: "Relax, it'll be fine—oops." A: "I told you so."

I told you so

I warned you in advance, especially of a bad outcome. For example, It's too bad your guests didn't get along with each other, but remember, I told you so .