[mdpopescu]

So are politicians when not lying and well-behaved children.

Correctly done comments are a one in a million thing. In my experience, they are utterly surpassed by "i = i + 1; // increment i" style comments. (Seriously, I'm working on code written by someone who teaches programming and he writes this type of comment.)

[AlexCoventry]

In an actual teaching context, a comment like that can make sense.