Danny Boyle v Ewan McGregor

At one time Ewan McGregor and director Danny Boyle were a Brit-flick dream team, but relations soured when, after taking the lead in three Boyle films on the bounce, McGregor was dumped for a post-Titanic Leonardo DiCaprio. Losing out on the lead in The Beach left McGregor majorly miffed and relations between the pair have remained seriously frosty since, proving a sticking point in any mooted Trainspotting sequel talks.