How long does a 16Gb iPad stay on the roof of a Mercedes E class when driven on a motorway?

This is a cautionary taleMany of us have all been in that busy parent situation with armfuls of stuff dashing in and out of the house while strapping our kids in the car

'Daddy can we take the ipad for the journey?'

Happy to oblige as ever as it equates to a quiet rapid journey

I could not open the door to the car and I was juggling a ton of stuff in my arms , so with the ipad on the top of the heap I committed the biggest no-no ever

I put the ipad on the roof of the car

'I will remember it' I thought

Except I didn't

Previously I have left a thermos flask on the roof of a car which made a whole 200 yards before reaching terminal velocity and exploding into a many, many small pieces.

So I left my village and joined the M25 at Junction 20, which currently has a 50mph limit on.

Then I took a very sharp turn up the slip road onto the M1

When it joins the M1 the 50 limit is lifted so foot down to the 70mph limit

Amongst the thousand things in my swiss cheese brain at the moment I wondered where the ipad was

I heard a dull 'flap...flap' coming from the roof of the car

I had my answer

It was on the roof and had been there for nearly 5 miles

Luckily I was right at junction 8 of the M1 so I decelerated without braking taking the exit

Would it even still be there when I stopped

I had after all travelled for half a mile in the dark so I had no idea if it would be there when I stopped.

It was.

Jammed between the roof bars of my car, teetering on the edge.

Rather like this...

I don't know what lesson to take from this other than don't put a ipad on the roof of a car, or anything for that matter.

Lady luck was smiling

Does anyone else have any tales of stuff left on the roof?