Right there with you. A coincidence to kick the action off at the very beginning can be cool. Using it as glue leads to really awkward transitions, but I'll forgive it once. More than 2 uncanny coincidences in a season? No longer uncanny, I often stop watching.

Dexter became a coincidence parade after the first season. But I couldn't keep watching once he became bad at murder. Relatability isn't a virtue if your character starts with a premise of prenatural skill, power, emotional baggage or any other attribute. I do not want to see dexter leave his wallet at a crime scene, let alone over and over again.

I stopped watching Arrow after it became clear that every single villain was going to be related to him in some way. "A-ha, what you didn't know is that I was your father's limo driver!"

I stopped watching True Blood when Bontemps started running out of citizens without a mystical hidden identity. If that show had been given another season the sherif would have been revealed a water elemental.

I could go on.