Steve-O says Bam Margera has yet again fallen off the wagon -- which leaves him with no choice but to accept that his old friend might turn up dead one of these days.
As you know, Bam's been on the road with his 'Jackass' costar ... opening for Steve-O on the first leg of his comedy tour. Bam even brought his son Phoenix onstage with him at one of the stops. All seemed to be well -- that is, until Bam posted a shocking caption this week that spurred a hard truth from Steve.