[SERKIT]

How about commas:
The mailboxes were red, green, and brown. (3 total mailboxes)
The mailboxes were red, green and brown. (2 total mailboxes, the second one was green AND brown.)

[xrmusn]

How about commas:
= = = = = = = = = = = = = = = = = = = = = = = = = = = = =

The Judge said the lawyer was crazy.
or
The Judge, said the lawyer, was crazy.

A panda went into the bar and ordered a sandwich. He finished the sandwich, pulled out a gun and fired a shot into the ceiling then calmly strolled out.
When questioned he said.
“I am a Panda, look it up”.

Panda,
Native to China, eats shoots and leaves.

(Thanks Lynn Truss)

[Tea Party Hobbit]

How about commas:
The mailboxes were red, green, and brown. (3 total mailboxes)
The mailboxes were red, green and brown. (2 total mailboxes, the second one was green AND brown.)

The mailboxes were red, green, and brown -- OR -- The mailboxes were red, green and brown. (We have no clue how many there were ... or whether any of the mailboxes had more than one color. But we do know that only those three colors were used!)