[thedoc (OP)]

martyn asked the Naked Scientists:
   Hello, I would like you explain this. I was driving behind this gentleman with a trailer, it had sheets of glass in it but suddenly
the sheets of glass flew out the trailer about 1 every second approx.
My question is why does this go against all known laws of Physics.
But if you watch the forbidden planet could this explain the unknown?
What do you think?

[Bored chemist]

I think the wind catching them is more likely to explain it than a TV show.

[evan_au]

I think that failing to tie down his load securely may also have had something to do with it.

[RD]

... I was driving behind this gentleman with a trailer, it had sheets of glass in it but suddenly the sheets of glass flew out the trailer about 1 every second ...

There can be vortex shedding behind a vehicle ...

https://youtu.be/tmU-dcK9Q_0?t=6s

which could produce anti-intuitive effects :
 e.g. objects being lifted-up instead of pushed-down by air flow , at regular intervals.

[Ophiolite]

Anyone who is so careless in the transportation of glass is no gentleman.

[alancalverd]

Aerodynamic lift.

It works for wood and metal aeroplanes, and many small planes are made of glass fibre. Air flowing over the top of a trailer will be at a lower pressure than the air beneath or within it, so the glass will be lifted. As the old saying goes, a piano will fly if you can make it go fast enough.