The sense of almost boyish enthusiasm that comes over middle aged men when pursuing a hobby that requires expensive stuff and leaves non-hobbyists scratching their heads to figure out why it's so damned important. (Derived from Roy Campanella's observation about baseball: "You got to have a lot of little boy in you to play this game.")
When Jerry began talking about model railroading, it was easy to see the Campanella Effect in action.
The special and different hangover that comes from drinking too much champagne. Usually involving a headache behind the eyes and sensitivity to smells.
Ughhh ... I had sixglasses of Cristal at Tom and Katie's wedding and am suffering from a disgusting champangover this morning.