Discussing weight lost on msn is really amusing.

Specifically asking a question like:
Is it me, or did so-and-so really lose weight?

and their replies are usually:
He lost weight
(emphasis on absence of punctuation)

so it gives room for assumption and interpretation, which may be highly inaccurate

1. He lost weight. (reiteration, for blur cai niaos like ty)
2. He lost weight? *in disbelief*
3. He lost weight. (confirmatory statement)
4. He lost weight?! Are you f&^%ing nuts? He's still as fat as ever.

HAHAHA

I choose to believe that people usually mean option 4.