Hey I engage in all sorts of bullshit risky DIY shenanigans but... the only answer anyone can really give you is "no, it's not safe".

In this particular case though I'd give you a "hard no, do not attempt".

IDK what your cistern is like but generally the fixtures just arent going to support an additional 60 to 100kg.

As a bonus, if it goes then it will shatter on the floor and you'll come down on top of all those wicked sharp edges. Fuck that.

Kinda curious why you have to reach the ceiling there, but... find another way, like a longer tool or whatever.

Absolutely not! Doesn't matter if you're 100 lbs. soaking wet! If you shift your weight wrong, it'll break both the tank and bowl. And ceramic is incredibly sharp when broken, think of it like non tempered glass.

Unfortunately no.

It's really not. It's not only probably gonna break and you have to deal with a broken toilet and water, ceramic is very sharp and it can fuck you up

Not even a little. That stuff is brittle and if it breaks you're going to have deep cuts up your legs. You've got important arteries in your legs, you could be dead by the time you reach a phone to call for help.

somehow I found this (but didn't see anything related to standing on the seat):

https://en.wikipedia.org/wiki/Toilet-related_injuries_and_deaths

In the past, this number would have been much higher, due to the material from which toilet paper was made. This was shown in a 1935 Northern Tissue advertisement, which depicted splinter-free toilet paper.

New fear unlocked. Good thing I have a bidet now

This sounds like a bad idea.

I broke my big toe that way.

Im not 100% sure how it all went down. But. I was standing on the toilet bowl. Lid closed (of course). I was leaning off to the left to reach a light bulb over the sink I was trying to get to .

Something happened where the seat came loose somehow. Slid sideways. In an attempt not to hit my head on the ceramic sink I over corrected my right foot. It went into the now open toilet. Big toe first. Full body weight.

Took like 3-4 months to heal.

Pretty sure it was just hairline fracture. Not a compound fracture.

But I was honestly lucky it was my big toe and not my head and the sink.

The lid was tight before I did this.
I thought the amount I had to lean over was not very much and it honestly didn't look like a risk. I was wrong.

I'm super lucky as I live alone. No one would have found me for at least a week.

Don't be playing around in the bathroom. Every surface is a death trap.

My friend who is a mortician told me a lot of people die in bathrooms. Like way more than you would think.

don't. it's gonna break and get water everywhere

No, get a ladder.

No don't. Even for just moving the toilet (to replace the wax seal underneath) you're supposed to disconnect the tank from the toilet, to make sure that the stresses on the bolts don't cause cracks in the porcelain. Toilets aren't held together all that well. I've been watching plumbing youtubes because I'm trying to fix a leak in one right now. It's not pretty.

Standing on the toilet seat is probably less dangerous than standing on the tank.

No. Tank has a rubber gasket connection to the bowl, and some bolts that maintain tension. Compromising that seal will flood your place, slowly.

Safe for you, probably, maybe. Terrible for the toilet.

I think it was Eastern Promises that showed that the toilet tank lid is the most dangerous part of the toilet.

i wouldn't. seems fraught with danger

As someone who recently was gifted a light aluminum ladder ... please buy one. Its saved my butt so many times. Feels like it weighs like 10 lbs and is clean and easy to use. Similarily, collapsible stepping stools.

Some things are just worth thr investment

No, that is absolutely not safe. Please don't.

No it's not. And whatever needs doing on the ceiling is either too unimportant to risk it or important enough to hire someone.

In case you’re still looking for someone to give you permission - that’s not me. They’re not made to support anything but the lid and contain the water. Even if you were to stand on the edges of the bowl you’d have a big risk - the bowl always expects an adult to have both feet on the floor and therefore much less than a full adult’s weight.

Lets be real, If you're asking that question, you're gonna do it anyways regardless of what we answer.

Probably a bad idea tho