Great image: This says it all. Is the glass half empty or half full

[geefloyd46]

http://laborspains.blogspot.com/2012/06/this-says-it-all-is-glass-half-empty-or.html

[Spitfire of ATJ]

1. There's an old joke about the half empty / half full glass

The Republican walks in and says, "Who's been drinking my water?"

[Ichingcarpenter]

2. Pessimist and optimist argue if its half full or half empty

the opportunist drinks the water while they argue.