The flavor of the ride totally depends on the group. It could be a fun safety oriented tour or a testosterone gone-mad free for all. If you get a sense that you don't really want to be there, just let the leader know before you take off (unless they're the kind of group that just drops you and forgets you)
Here's a local ride in which there were 4 (yes 4 !) crashes including one guy who actually ran into a Highway Patrol car ! (it's all on the video) I would have dropped this ride pronto if I were in it !
ride with 4 crashes video:
4 Crash in one ride
Here's a local ride in which there were 4 (yes 4 !) crashes including one guy who actually ran into a Highway Patrol car ! (it's all on the video) I would have dropped this ride pronto if I were in it !
ride with 4 crashes video:
4 Crash in one ride