Metasyntactic Variables

Use conventional metasyntactic variables for your examples. It tells programmers to focus on the implementation not the content.
Good Bad
foo bar baz
whatever

Metasyntactic Variables in the UK: Wibble & co.

If you are from the UK, you may want to use these variables.
Good Bad
wibble wobble wubble
boy oh boy

Metasyntactic Variables in the UK: Fred & co.

Alternatively, UK folks may want to use these variables.
Good Bad
fred flob
great scott

Pythonic Metasyntactic Variables

If you are writing Python, put spam, ham, and eggs in your examples.
Good Bad
spam ham eggs
wham bam thank you ma'am

French Metasyntactic Variables

If you speak French, maybe you should use these wonderful French metasyntactic variables.
Good Bad
toto titi tata tutu
it's only wafer thin

Italian Metasyntactic Variables

If you speak Italian, maybe you should use these special Italian metasyntactic variables.
Good Bad
pippo pluto paperino
goofy donald duck

Singular example

Sometimes you need only one code sample.
^..^