Hoist by his own petard

Commenting on typos can be a very risky occupation.

The more you shout about them, the more likely it is that others will point out your own.

Case in point: Peter. He blogs about his life on a narrow boat and occasionally posts photos of signs he comes across on his travels.

Most of them are worth posting again.

Here's one.

And another.

But you know what they say about people in glass houses.

Thanks for comenting, Peter. Your hummiliation is duly noted.