My personal favorite party rejection was the PL telling me I had to have X HP to run the quest or he was going to kick me. I dropped group and solod the quest on elite. I was 3/4 done before they ever got started. I had a guildy in the group, and he kept me posted on how they were doing, turns out, the PL, who had more than the expected HP was the first one to die. Gotta love those.