There's a movie from the 90s with Eddie Murphy called "The Nutty Professor". It's the first movie in which the trope of Eddie Murphy playing all the characters started from.
Anyways, there's a line in the movie where the dad walks out of the bathroom after having just taken a shit, and he says "Whew! I feel 10lbs lighter!"
It's meant to be comedy, but I just remember thinking when I saw it "10 POUNDS??? Holy fuck dude! Thats not something to joke about! You didn't engage in a funny situation. You have a medical problem, and now you're going to be in life crippling debt!"
I've done it. I've dropped deuces that were so enormous they filled the bowl and just about touched my ass. And I weighed exactly the same after as I did right before. Makes no sense.
Your scale is not accurate.. I had a digital scale that was similar, I could weigh myself, pick up a small object with a known weight, and it would read the same number, down to the tenth of a pound.
I replaced it with another scale that's more accurate.