Triggers (among others) are:

:eek:
:mad:
:cool:
:)
:(
:blush:
:crazy:
:D
:o
:/
:confused:
:grin:
;)
:cry:
:puke:
:finger2:
:finger1:
:rolleyes:
:evil2:
:napalm:
:eek3dance:
:jack:
:headbang:
:hmmph:
:gay:
:bsflag:
:wtf:
:w00t:
:iamahomoforusingthis:
:dunno:
:ethanv:
:iwishihadawittynameforthisicon:
:emo:
:pandAr:
:laugh1:
:jsmonet:
:arizona:
:tongue: