Lovecraft used tentacles to evoke an alien unknowability.
This association became massively popular, a well-known aesthetic in the cultural consciousness, entirely undermining the intended effect.
The same goes for "random humor".
Always the sporks, the waffles, the narwhals and platypi.
The whacky macaroni.
Animals and food-related objects with a certain "mishmash" quality, and a certain ring to their name.
Humor requires novelty, which randomness is good for, but "LOLRandomness" is not particularly random.
The disconnect between intention and outcome generates cringe.
Or, in luckier cases, gap moe.
A string of random numbers (eg 6643915530) is not funny, because you see it as simply entropy, and thus, find it predictable.
You gloss over it.
You can't predict the next number, but you can predict that the result will look like a string of random numbers, and that's all that concerns you.
Hence, there is a need for patterns.
With patterns, you set expectations, which allows for expectation-breaking, a deeper sort of unpredictability, novelty, setting the stage for more general comedy.
Foam Adventure is a very good case study.
A common aspect of LOLRandom humor is the emphasis on cultish commitment to the object of interest.
This is the actual "joke"; it isn't just the randomness, it's the juxtaposition of randomness with dead-seriousness, the elevation of incoherent bullshit to divine status.
Often, the joke is simply to place as much emphasis as possible on something utterly mundain.
The humor comes from the outsider's (or even the insider's) inability to understand this associated importance, begging the question "why this thing, and not some other?"
to which there is (ideally) no logical response.
Comedy by way of incomprehensibility.
To be "random" is simply to be unpredictable, and unpredictability is a matter of the capacity of an observer to predict.
Randomness is unknowableness.