"The guillotine was invented in Halifax in Yorkshire in the 16th century. The French Revolution's Dr Guillotin did not invent the device; he merely recommended its use to the National Assembly. His ancestors changed their name to avoid being associated with the machine." - QI column, Telegraph Weekend, 12th May
Obviously, he invented a time machine though. Otherwise, how could his ancestors have retrospectively changed their names? (And why did he revert to the old one?)
As I have pointed out before, it is a bit odd that a column devoted to interesting facts seems to get it wrong more often than one might hope for. Perhaps they should save up for a sub-editor to check these things a bit more carefully? Especially in the edition of E facts that includes Errors.

16/05/07 @ 14:42