Yeah, I know them. XD is sort of
taken to another level. You're laughing so hard your eyes are scrunched up.
I wouldn't say that, really. The scrunched up eyes are the -
- "ugh" feeling. Like... say you're laughing/big smile while saying "Oh dear, this is
not good", or having a tinge of sarcasm or cynicism or dark humour or SOMETHING in your : D or : P.
Both, especially : D, are happy feelings. But you can smile or tongue without being (just) happy. If you've just done some big mistake, but you can still see the funny in the situation, but it's not
-funny. It's not:
"We just screwed up royally, didn't we?" : D but
"We just screwed up royally, didn't we?" xD
Which is what I kinda feel right now... xP (And here I suppose the xP is the cartoonish sticking out your tongue in resignation...)