In the old days before Twitter and the invention of pop music, all celebrities were intellectuals. If you were in the public eye for something other than politics or murdering someone, it was probably because you'd written a best-selling novel.
Of course, authors are notorious narcissists, unable to accept criticism but perfectly able to dish it out. As our gallery shows, they love nothing more than a good slanging match. Preferably in public.
Turns out that boffins do the best insults...
(All images: Rex)