Cryptid Idea: Coinci-Kitty
You find a cat that has been deposited in your trashcan via the Cat Distribution System. No matter what you try to do (trap it, drop it off at a shelter, adopt it, etc.), it hangs out in and around your house/apartment for a week or two before disappearing again.
During that period, you are BOMBARDED with coincidences. You run into old friends who you were JUST thinking about. You and both of your roommates have the exact same part of your cars break on the same day. There's a massive downpour nearly 30 seconds after you finally remember to set up those rain catchers. They're not all good, they're not all bad, they're just SUPER unlikely.