The claim that 'million to one chances come up nine times out of 10' is a fictional or humorous expression popularized by Terry Pratchett's Discworld series, not a factual statistical statement.
Million to one chances come up nine times out of 10.

FactVerify
Source: factverify.com
Key Evidence
Terry Pratchett's Discworld explicitly states that 'million-to-one chances crop up nine times out of ten' as part of its fictional narrative logic.
tvtropes.orgtvtropes.orgMillion to One Chance This phrase is widely recognized as a humorous or metaphorical expression rather than a factual probability statement.
elearningstuff.netelearningstuff.net"million-to-one chances happen nine times out of ten"
tvtropes.orgtvtropes.orgBest Quotes for Million to One Chance
What the Evidence Shows
The claim breaks down into two components: first, the notion of a 'million to one chance,' which implies an event with a probability of one in a million; second, the assertion that such improbable events occur nine times out of ten, which contradicts basic probability principles. Evidence shows that this phrase originates from Terry Pratchett's Discworld novels, where it is used humorously to illustrate the whimsical and narrative-driven nature of that fictional universe.tvtropes.orgtvtropes.orgMillion to One Chance
The phrase is often cited as a witty commentary on improbable events seeming to happen frequently in stories or life, rather than a literal statistical fact.elearningstuff.netelearningstuff.net"million-to-one chances happen nine times out of ten"
tvtropes.orgtvtropes.orgBest Quotes for Million to One Chance In reality, an event with a one-in-a-million chance would not be expected to occur 90% of the time; such a frequency defies mathematical probability. The claim is therefore misleading if interpreted as a factual statement about real-world probabilities.
It is best understood as a literary or philosophical observation about perception and storytelling rather than an empirical truth. No credible scientific or statistical source supports the literal truth of the claim.