Newly married and trying to impress new DH he said he loved rice pudding, with a nice golden crust, so I asked my MIL how to make it from scratch.
The amount of pudding rice looked lost in the dish so, thinking she'd written it down wrongly, I poured in half the packet, added more milk and sugar and put it in the oven.
Sometime later I could smell burning so I opened the oven door to an avalanche of molten rice pudding.
It not only filled the bottom half of the oven but then flowed across the kitchen floor, under the cooker and units.
I cried buckets trying to scrape it all up, DH was helpless with laughter and when he told his mother it just confirmed her opinion of me 
The oven never really recovered, the smell of stuck on burnt rice still haunts my memories and if DH wants rice pud he can open a tin!