We came back from celebrating my wife's 30th with friends and found the cistern had a crack in it. Not fun, but at least there was no smell.
We thought originally we would replace the cistern, but then the pan had a messed up seat fitting so we decided to replace the whole thing.
DW and FIL thought I shouldn't DIY it and there was a micro-domestic in the local hardware store as we debated getting a plumber in.
This is a toilet whose pan was cemented to the floor and they simply couldn't believe you could use silicon instead of cement to place a toilet and as such strongly suggested we get a plumber.
I essentially ignored their advice and took the day off work. I bought a new toilet, some masonry chisels, silicon and a tile drill bit and installed the damn thing myself.
Based off online quotes I believe I saved about $500 and got paid to do it as the boss let me take sick leave.