Car Bills

Why do unexpectedly huge car bills always always arrive 24 hours after booking a holiday ?
It's been an expensive month. The fridge freezer died. We had to replace it. The ensuite saniflo is making weird noises so we have Mr.Saniflo coming tomorrow to `clean through the pipes thoroughly`
( rather him than me ) and we just booked a holiday to Spain. Holidays are optional I know, but we booked it before hearing Gavin's car needed a new clutch and starter motor. I knew it was going to be grim when man-at-garage asked me if I was sitting down. I was; in my car, which will never need a clutch because it's an automatic. I have a manual driving license but prefer to live in a world without gear changes, hill starts and handbrakes. I spent the afternoon boring my neighbour with all this, over several cups of coffee.
I am optimistic. July will be a month of sunshine and frugality.