What are two things that are good on their own but bad when combined? And bad things that are good when combined?

avidseeker@lemmy.world to Ask Lemmy@lemmy.world – 128 points –

I just learned about "Salt (NaCl) is actually a combination of a highly poisonous gas (Cl) and a hazardous metal (Na)".

I'm sure there are lots of examples in life that this rule also applies to.

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Love onions and love gravy. Put them together and we’re going fall out quickly.

What!? Onions with gravy on them, and gravy with onions in it, and onion flavoured gravy are three of my favourite things!