Not knowing how to use a coathanger...
You can helicopter your banana but you can't banana your helicopter
F1 driver doesn't think he's a cab driver
I carry my laptop outside and if it gets wet I know it's raining!
Someone who knows how to play the bagpipe and doesn't.
To bone up on his schoolwork.
Plot Holders.
A potato wedge! (I made this up when I was 9)
It's are all red and glossy.
Mrs Hawking
The wheelchair
A coathanger.