A builder came round today

A guy popped in to install a new ventilation system in my Kitchen.

He told me he was a former farm machinery enthusiast.

… or an ex tractor fan…

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popped in / popped by, stopped in / stopped by, came by / came around

I’m not sure what your question is, but…

These expressions generally imply a short and unexpected visit.

I don’t think I would ever say someone “popped in” to do something as elaborate as installing a new kitchen ventilation system.

I tend to use “came around” when someone shows up at my doorstep, not only unexpectedly, but also completely unwanted:

A door-to-door salesman came around one day trying to sell me a Kirby vacuum cleaner for two thousand dollars.

A couple of Jehovah’s Witness came around one day trying to convince me that the world was coming to an end very soon.

I’m not sure what the purpose of this post was either, but I agree with the above comments by the Brucenator.

JimboUK is a native English speaker, so it wasn’t a question about English. It was a play on words.

Extractor fan relates to " ventilation system ", while “ex tractor fan” relates to farm machinery.

Oh, I see, yeah. Unless it’s a good actor playing Mercutio saying, “Ask for me tomorrow, and you shall find me a grave man” or something, oft lost 'pon me is the pun.