After 9/11, everyone was going around, proclaiming the death of irony, and I'm guessing humor in general. Of course, this was all laughed away (pardon the pun), because hey, humans often cope with tragedy using humor.
Little did we know that sarcasm was the one given a lethal injection.
After making the remark, some passengers became alarmed and called 911 on their cell phones, prompting Mickens' arrest at gunpoint after 18 township patrol cars converged on the bus. He was then charged with creating a false public alarm.