Watch: Derek Chisora Headbutts Delivery Driver

In some ghastly scenes former heavyweight title challenger Derek Chisora headbutts delivery driver in the UK.

Not just any old headbutt but a brutal one too.

One that dropped the delivery driver and likely is going to land Chisora in a lot of hot water here:

It is not clear what lead up to the incident.

A crowd can be seen gathering around both Chisora and the delivery driver.

Then with Chisora holding onto the driver before delivering the head butt.

It is not clear what may have prompted or provoked him yet.

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Nonetheless, an outside the ring moment of madness like this is the last thing Chisora needs.

Not a good look for either him or boxing frankly.

Particularly involving such a high profile heavyweight in professional boxing.