Sometimes, I just don't feel like being very peppy. :P

Just a couple thoughts:
Guys, it's probably not a good idea to tell a girl she looks tired, even if she does. You're not winning any points there...
Also, being excessively complimentary is not neccessarily a good thing. Hyperbole is only effective if used in small amounts. The more overly dramatic compliments you give out, the less they mean.
That's my opinion anyway.