I wouldn't say he was ugly but: When his grandfather was born they passed out cigars. When his father was born they passed out cigarettes. When he was born they simply passed out.
I've changed my mind. Well I hope it works better than your old one.
If his IQ was two points higher, he'd be a rock.
His mouth is in gear, but his brain's in neutral.
She's knitting with only one needle.
The lights are on, but nobody's home.
There is no vaccine against stupidity.
If ignorance is bliss, you must be the happiest person alive.
I would ask you how old you are but I know you can't count that high.