Shino laughing was in the episode with the guy who hired them to stand in for him at a funeral, Shino was picked because one of the conditions was that no one was allowed to laugh. If the eldest of the family laughed, the fortune would be split among the family members, rather than all going to him.humm, i think it was the episode ~sage~ posted when team 7 are tryna see under kakashis mask, shine when he laughed in one of the fillers, or possibly when sakura tried to kill sasuke
but that was more of a wtf :|, than a wtf O.O