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Saying you're down to do something means the same thing as saying you're up for it.
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Sounds like you just used the guardian's op ed which is just some random dudes opinion on how they should be used.
https://www.merriam-webster.com/grammar/flammable-or-inflammable
I was well aware of the famous infamous thing though.
Regardless, infamous should be 'not famous'. As in nobody has ever heard of this person. Not famous for evil lmfao.