Bill James' thoughts on the official rule, the rule as enforced (or not) in actual practice, and how things should be.
Some recent examples (not up the line, but catcher is on top or in front of home plate):
Most Famous Example of All:
Debate on this subject...
What are your thoughts on the topic?
What should the rule be and how should it be enforced?
How has it changed since you've been watching baseball, and has the change been for the better, or worse? What have people read about how things were 50-100 years ago in practice?
Should collisions be part of baseball? What are some of the worst you remember, and who was to blame?