This command makes an object display an emoticon sprite above their own as
if they were doing that emotion. For a full list of emotion numbers,
see 'db/const.txt' under 'e_'. The inobvious ones are 'e_what' (a question mark)
and 'e_gasp' (the exclamation mark).

The optional target parameter specifies who will get the emotion on top of
their head. If 0 (the default if omitted), the NPC in current use will show
the emotion, if 1, the player that is running the script will display it.