Give me some new ones.
Some of my current favorites include;
- A few balloons short of a parade
- Banging like a screen door in a hurricane
- I think his cheese done slid off his cracker
- As useful as Anne Franks drum kit
- Carrying on like a pork chop in a synagogue
- Who pissed in your Cheerios? (better than the US iteration that features cornflakes)
- Closing the barn door after the horse has bolted
- Dumber than a bag of hammers
- The tail don't wag the dog