Laws of the Sandwich

I am currently formulating my laws of the sandwich. Here are my prelimenary thoughts - but comments and refinements are welcome -
BAYLEY's FIRST LAW OF THE SANDWICH - LETTUCE IS ALWAYS AT THE BOTTOM
As far as I can see this rule is immutable and constant. It does not admit of any exceptions. If you can think of any let me know.
BAYLEY'S SECOND LAW OF THE SANDWICH - GARNISH IS ALWAYS ON THE TOP
Again we seem on safe ground. Egg and cress? Cress on the top.
BAYLEY's THIRD LAW OF THE SANDWICH - SOGGIER STUFF ON THE TOP
This is more controversial but largely seems to hold good (except for garnishes). So, in your BLT, the soggiest food - the tomatoes go on top. In Cheese and pickle, the pickle goes at the top. Ham and cucumber - you get the picture.
This law seems to break down if heat is applied to the sandwich. So in your scrambled egg and bacon sandwich it appears acceptable to have the egg at the bottom. It may be that the application of energy to the sandwich equation results in the bacon behaving like a garnish. More study is required.
BAYLEY's FOURTH LAW OF THE SANDWICH - SOGGINESS BEING EQUAL, BIGGER ITEMS ON THE BOTTOM
For example with cheese and onion, the onion will go on the top.