My mum is the classic recipe messer - to the point where her sisters have dubbed her Mrs Cropley. There's nothing wrong with experimenting in cooking, but whenever mum tries it, things never seem to work out.
I've been making my chicken cacciatore for years, and have had many recipe requests. My special ingredient is marsala wine at the end of the cooking, which adds a subtle sweetness to the dish. When mum made it once she didn't have any marsala, so instead of just a bit of wine or sherry, which would have worked fine, she added Galliano to the mix, because in her words, "Might as well have something Italian in there". It was revolting!