no prize for guessing

Noun

 * You get no prize for guessing what happened when the spider landed on her plate.
 * You get no prize for guessing what happened when the spider landed on her plate.

Usage notes
This phrase can be used as an interjection:
 * The top student was &mdash; no prizes for guessing &mdash; Sharon.

There seems to be significant use of this phrase that disregards the normal plural agreement of verb and noun:
 * There's no prizes for guessing why my mum wasn't happy with that.