snake's suspenders 

1. An archetypal "just plain weird" thing to which something else can be compared to demonstrate that it, too, is weird.

2. General term for anything odd, surreal, or having the elements of non sequitor.

1. "He's as sweet as a stolen kiss and as weird as suspenders on a snake." ~The ineffable Jubal Harshaw describing Mike Valentine, the naive but intriguing titular character of Stranger in a Strange Land.

2. Have you met the new lab technician? He does good work but boy, if you get to talking with him he's snake's suspenders.

snake's suspenders by Noh Panse October 30, 2007