what is the cause for coincidence?

Is the world itself intelligent? They say everything happens for a reason. Coincidences are prevalent. Is nothing private? The world seems godless but there are all these hints. Perhaps the human has created a way for this to occur. Is it magic? are coincidences a corruption of insight ? what does Buddhism have to say about this? example of coincidence per request: two customers in a pizza shop: the first customer says to the cashier while paying, "get your tips". the next customer in line **does** tip on his order and although he overhead the previous customer's comment, he **did not** notice the first customer giving tip. finding it slightly strange, since he was already planning on giving a tip. a strange feeling overcame the customer and cashier as he leaves the shop. example 2: is it not a coincidence that Buddha sculpture made from stone is like the real ones, like very still and stuff?