The moment when a client dumps you for a "cheaper solution" and after a year his site get hacked and calls you to rescue him. Priceless.

@g-m-f I forwarded his request to the dev/null department :>

It's a great day. My mother used to say 'what goes around comes around'. Sounds like an endless loop but a lot of truth.
Congrats!

Sweet, sweet karma

Do it. Just charge the shit out of him now.

By experience, you'll have to do lot. First unfuck the cheap solution and then do your shit.

My favorite is when it's unfinished and they expect you to give them a discount because they already paid "lots of money" to the failed developer, but they already "did a lot of the work for you" so you obviously won't have much left to do.