Will you be exhibiting this year?

Don't muck about with the video machine, or you might break it.

The solitary, lumbering trolls of Scandinavian mythology would sometimes be turned to stone by exposure to sunlight. Barack Obama is hoping that several measures announced on June 4th will have a similarly paralysing effect on their modern incarnation, the patent troll.

They said: “I'm hardly best pleased to receive this and neither, I presume, are all the others whose confidentiality has been breached by this.”