This is an old one but it needs repeating until the message gets through. On the BBC this evening I saw a programme about Robin Hood's Bay in which the presenter said: "It is difficult to underestimate the power of the sea".
This script was probably written by some public school, Oxbridge educated, person, seeing as it was the BBC.
Also, I saw in the Daily Telegraph this caption to a photograph: "Giles Coren, who's Jaguar was stolen..."