Ancient Egyptian cultre is really interesting. Did anyone know, some pharoahs had loos in their pyramids??!!!

Well, pyramids were places for important rituals, Pharaons knew them very well. Their soldiers or slaves had closed in the pyramids after Pharaons died (sometimes Egyptian were amusing and friendly!)

Well, as far as I know --and as far as it can be known-- pyramids weren't places where pharaons could lose their way simply due to one of these two reasons:
1) Most of them were places in which pharaons had to be buried when died. They visited them during its construction, but that's all.
2) Some pyramids (such as the Great ones, at Gizeh) were mistical temples and not burial places --it's never been demonstrated the contrary.
In both cases, visits of pharaons (if there was any visit) were groupal visits: Pharaons were presumably accompanied by people who knew ways in and out.

Under Zoser pyramid (Saqqara) there is a real labirint of chambers. I suppose it's the only place where someone could have lost. But there are no evidences.