Hmm. Through the analysis of your post, I assume you mean a log so huge and stiff that you cannot imagine it will ever fit through your exit hole. You know, where it gets "hung-up" on that first inch as it is poking out of the hole a wee bit? And then how when the resistance of the sphincter muscle finally gives way to the internal muscles forcing it out, it is like a potato out of a potato cannon and you have this insane feeling of relief and feel like Heaven's gate has opened up to you and you hear Angels singing? Yes, I understand what you mean. Through analysis. Get it? Like, double entendre there. And shit. (DOH! Triple entendre now, boooyyy!) HHAHHA
Yes, so long as one is eating enough fiber. This way it is assured that your content is in the bottom, waiting to escape. I say this through nothing but logical analysis.
You ever take a shit so bad you end up Snartapiss... That is where you sneeze, fart and piss at the same time. I did that once and actually went back in time 30 seconds.