Bam Margera Calls for 'Jackass 4' Boycott, Talks About Suicidal Thoughts

Bam Margera just went on a nearly 10-minute tirade -- about his own suicidal thoughts, and about being pissed he's been shut out of "Jackass 4." Bam railed against the studio and producers behind the 'Jackass' franchise ... claiming they used his…