I confess that one day I was very frustrated with moths - who were plaguing my room night after night - so when I had caught one in a transparent plastic box with a lid, instead of letting it go out the window as usual, on that occasion I decided out of malicious anger to leave it in the box, all night, to die. But I wasn't prepared for what I saw when I woke up the next day. I expected it to be dead and it was but the walls of the box were a mess with I can only guess was moth-shit all over them. So if anything convinced me that insects (possibly) have consciousness it was that; it basically looked as if the moth had done what any conscious creature would do in the same situation... panic and frantically try and escape, perhaps shitting itself in terror in the process as it frantically headbutted the walls. Anyway that callous act has haunted me ever since... the needless suffering that I wilfully caused to a sentient being 
