We were somewhere around Barstow, on the edge of the desert, when the
drugs began to take hold. I remember (Dave) saying
something like:

Found this in the garden, looks like something used to key 2 bricks
together, but why is there a twist in the middle?

http://www.dalecu.co.uk/images/dscf0016.jpg

A cavity wall-tie, the twist is for moisture to drip off.