The M25 and the M1 are chatting in the pub.
"I'm the hardest tarmac, ever! I'm rock hard," boasted the M1.
"Yes Bob, you're rock hard," agreed the M25.
"My middle name is 'Hard'," and just to prove it the M1 downs a pint in one.
Just as he's put the glass back on the bar a red piece of tarmac walks into the pub and orders a pint.
The M1 dives under the nearest table and stays there quivering until the red tarmac leaves.
"What was that all about then?" asks M25, "I thought you were really hard?!"
"Yeah, b-b-but that guy's a cycle-path!"