Answer a question with a question.

[Paulus]

are they at work, or going home?

 

[Lullabelle]

Are they on a train?

 

[Kies]

why would you be on a train when you have a bike?

 

[tyred]

Don't you find that the sleepers make riding along a railway line very bumpy?

 

[steve52]

do many sleep ride?

 

[classic33]

What would happen if caught sleep riding?

 

[tyred]

Wouldn't you fall off?

 

[shouldbeinbed]

would you notice?

 

[User33236]

Notice what?

 

[classic33]

You mean you've not noticed?

 

[User33236]

Has anybody?

 

[tyred]

Can you sue if you bang your head on a "mind your head" sign?

 

[classic33]

Was the sign on the wall or overhead?

 

[User33236]

Does it make any difference?

 

[Andy_R]

Why wouldn't it?