I've seen a great many of them.

In fact, I know a guy who's been using one to commute all over town for the last year. He's gone through four of them so far because he doesn't do even the most basic maintenance; he just rides it till it dies and then walks to Wally Worm and buys another, ad infinitum.

I keep telling him that he could've had a real quality bike by now, with all the money he's been spending by replacing those turd bikes every three months.