I used to hate making trips to the "big board," waiting for all those images to load and finding the one I was looking for. Since then I've learned the text versions of several of my favorites:

:D =

:p = (That one's case-sensitive -- :P is just :P)

:dunno: =

:ROTFLMAO: = (Also case-sensitive as far as I know)

:outtahere: =

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All those were from memory!