Elvis Costello has a song (title of which eludes me, naturally - Faldage, fill in this blank too?) in which he describes someone as being "a few chips shy of a fish supper." One of my favorites, especially because of the blank looks it gets on this side of the pond.

p.s. To my astonishment, Ænigma had no problems with Elvis or Costello - it's more cultured than I'd thought.