Clink

I was watching Smallville recently and my 2nd favourite character (1st being Lex) of the show Lionel Luthor narated an interesting story on the origins of clinking glasses...

As it went... in times past.. there was a king surrounded by his advisors... his advisors had planned on ousting this king, and had poisoned the kings drink.. the king being a shrewd man however clinked his cup against that of his advisors... droplets of his poisoned brew landing in his advisors cups... the advisors drained their cups while the king merely sat down and observed his advisors as they one by one died a slow painful death...

From then on the gesture of lightly clinking glasses became a sign of trust.