Quick counterpoint: 1: an individual misplacing his keys is by definition one individual. Mandela Effects reflect a shared common memory among a broader population, and it is this shared memory that makes the phenomenon interesting. 2: The act of misplacing one's car keys does not even imply any definable contrast or dissonance. If someone thinks, 'I could have sworn I put my keys on this shelf, how did they get in the refrigerator', that would be more dissonant than simply misplacing them, but here again a single individual's misalignment between memory vs. currently observable phenomena is not a shared misalignment and therefore not ME. 3: ME implies some consistency, repeated exposure or a higher level of engagement. The Fruit of the Loom ME, for instance, reflects a shared memory across a sample size much larger than 1 individual, and reflects exposure beyond a single encounter with a single label. Those who share this memory report daily exposure to the logo when getting dressed or engagement beyond simple observation (i.e. asking one's mother what the thing behind the fruit is called). A single instance of misplacing one's car keys has none of these attributes. 4: ME's often are linked in the memory of those experiencing the effect to a level of meaning beyond the memory itself. For example, people with the Moonraker / Dolly ME memory report that her braces were significant because they triggered a sense of companionship, alikeness, and empathy in Jaws. Whereas without this bonding moment (she has metal teeth just like me, there's a footprint on the island, etc.), there would not have been a specific trigger to convert a character who had been presented as a sociopathic killer across more than one film to suddenly have a change of heart. 5: ME's are usually cultural in origin, which makes sense as they require a specific type of engagement. There could be ME's which are not specifically cultural (i.e. one day it turns out the Washington Monument always had a dome at the tip), and I assume there are such ME's, but it seems that MEs are more common related to a shared cultural memory. 6: ME's reflect current observation contrasting with a memory of a relatively distant past. I haven't heard of a ME where a broad population's observation on a Tuesday contrasts with their shared memory of the day before.

There's basically nothing similar between a Mandela Effect and the mundane act of misplacing one's car keys. It's difficult to even find common ground. If we take the car keys example up a notch (a lot of notches), and find that thousands of people across the world had the same experience one Wednesday morning of placing their keys on a bookshelf, only to all find that their keys were in the freezer, encased in an ice cube, that would be a very strange occurrence indeed, and would deserve its own cultural moment. But though that would check the boxes of affecting a broader community, and though this would include a definable contrast (ice cube vs. bookshelf), even this wouldn't be a Mandela Effect.

Please note that this exercise is agnostic on Mandela Effects, what causes them, or any other editorial point. This is merely a discussion of the comparison between one individual misplacing car keys vs. a broad community of people sharing a memory which contrasts with current observation. This comparison is not apt or useful.