You're not just being inconsiderate to your landlord, though

'Monster' fatberg found blocking east London sewer

Perhaps the endorphin hit from sticking it to your landlord makes it all worthwhile.

This year, on some random holiday, I had to take 20ft of piping out of the walls and remove one solid block of hardened grease that had accumulated there, blocking the pipes, causing dirt water to flow back into the kitchen and into appliances. What a joy that was... the stench alone.

Don't flush grease down the drain.

And so does the money.