Fred was near death.  As his condition deteriorated he motioned
frantically for something to write on, and the pastor handed him a pen.
Fred used his last bit of energy to scribble a note, then died.  In the
commotion the pastor put the unread note in his pocket.

As the pastor was giving the eulogy at Fred's funeral, he realized he
was wearing the same jacket as when Fred died.  He said, "You know, Ol' Fred
handed me a note just before he died.  I haven't looked at it, but I'm
sure there's a word of inspiration for us all." 

He opened the note, and read aloud, "You're standing on my oxygen tube!"