It is a little hard describing why I find this so funny, but seriously, the first time i saw it i was bawling in laughter for an hour, and chuckling for hours there after and still I can laugh about it, and have it tickle me.
It has something to do with that being such a true and appropriate warning message, and being so straitforward. I mean, if you've ever been in charge of something but should contact someone if something goes wrong, but you dont know how wrong something needs to go before you notify them, this kind of a description is such a beautiful and clear and accurate description of when to make that call. And anybody could see what was happening in that construction yard and know if to make that call. Just ask yourself.... is this a HUGE fuck up?