Oooh I can think of lots.
I bought scone mix and added cheese, only to find out it was sweet scone mix. I had to throw them all away they were gross.
Most vile was when I was very little. My mum made a liver casserole (yuck enough in the first place) and for some reason must have left it in a metal container. She wanted us to eat it the next day, even though it had turned to a puree that looked like baby poop, and it tasted like bile.

She forced us all to eat a spoonful before agreeing that it was the most sick thing in the world.
My mum put some plastic coffee jar lids in the oven to dry out (she wanted to use the jars for pickled onions) and melted them all to her oven tray.
When we were little my sister got her long hair caught in the electric mixer when we were making meringues.
My mum decided to use the microwave one year to cook the Christmas duck and incinerated it - she put it in for the right amount of time, but forgot to set the power level to half.
My best mate burnt through the hob covers when he turned on the wrong ring.
My mum had a casserole explode in the oven.
As a kid i melted a plastic pepper pot into the toaster, trying to dry it out on top of the toaster.
I melted (luckily didn't burn) a lap tray (full of polystyrene beads) in a carrier =bag on top of an oven tray, when I turned on the grill, without remembering to take all the stuff off the top of it first.
I had made bolognese, and was cooking the pasta. Was a bit busy so said to the OH can you put the bolognese in (it was next to the microwave, with cling film on ready to be heated) and the daft sod, put all the bolognese into the pan of pasta and boiling water! Luckily I don't use much salt, and the pasta was pretty much cooked so we just has slightly more watery bolognese than usual!
I dropped curry all over our sofa. Even though it's navy blue and I washed it immediately 2 of the sofa seat cushions are noticeably neon yellow!