Question: Minor Q D:

If your question is about the Strikethrough BBCode, it's just [s]Word.[/s], which results in this: Word.
Testing Smilies:
:)

It appears that the smilie will only be struck out if there is text around it. Otherwise, it will not.

Also, darn you Cherii.

~Momo Uchiha~ said:

I have a question about this:
what?
I know I've seen some other people do that but, I don't really understand 100% why. (even though I did it myself).

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Well, mainly, it gives a double meaning to a sentence, sometimes using humour, or irony.
For example: Momo Uchiha is fugly cute.

...or sometimes, to make a rather different comment, and 'get away with it'.

~Momo Uchiha~ said:

and. Are smilies going to be crossed out too if u use this?

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Try it out for yourself. :)
No, they don't get crossed out unless followed by text.