Assuming Suicide Squad is a hit, the cast might think twice about returning for the sequel. 

Jared Leto's behaviour off camera has already been well documented. Leto reportedly sent a variety of 'gifts' to his co-stars which included a dead rat for Margot Robbie and a box of bullets for Viola Davis. 

However it seems Leto wasn't the only one playing games with the cast. As part of their preparations for the movie, director David Ayer insisted that the cast participate in group therapy sessions. Then during filming, Ayer would use information that the cast shared in those sessions against them in order to illicit spontaneous and unhinged performances from them. We're sure The Joker would approve. 

Whether the tactics will translate into a great performances remains to be seen. 

Via Digital Spy