So my worst experience with a project manager was this:

New changes to the system came in, and i was the developer of android frontend back then
So he's shouting at me like 'why is dis so slow, why deez delayed, why those render misaligned on the orbitrary tablet, etc.'
So we finish in like an hour, he walk away back to his office, I went to smoke, came back, oh hey, I wanna go to the toilet
And back then at that place we had a small one person WC, so when someone was there, anyone else would have to stand outside the cabin
So I come next to it, oh, fuck, occupied, and I hear ridiculously loud and echo-y splashes of pure solid shit hitting the water surface)
A min later the thunderstorm was over, the door opens, and my PM rushes out, sees me, stops (I was in his way) and gives me a deathstare for a quick second. Awkward moment's over, he walks around me, but I just could not keep my mouth shut, so I said aloud

"Well, no wonder"