Found out what it was. Feel a bit daft.

Elderly lady writer who was using her daughter's laptop. Daughter has animated cursor. A little fly. 

Them thunderbugs get into everything.

Hahaha. To be fair, I don't think I would've guessed that in a million years.

That sounds very early Internet days

Much like those signatures that were so popular once. You know, where people demanded at least half a screen of blinking, flashing animated gifs. 

And the era of flash signatures! Some of the oens here were mad, I think Xen had some with games embedded

I had a little game of blackjack with an owl dealer that remembered your score and stuff. Flash was great for whipping up little toys in a semi-visual way, never found owt to replace it.

I loved Sulkpot's sig. It was just the letters of his name in rainbow colours but it swooshed in a very pleasing way when you rolled over it, always satisfying. 

The signatures of teh were, and are, models of taste and common decency. The signatures of those who have bathrooms equipped with Italian marble and gold taps, drive 8 litre V12 trucks to Tesco, and employ signatures created with Frontpage Express by MY MATE KEV (or Tarquin, or Brian), are another matter.

Oh for sure. 

I like the ones that listed all their gear (yes, mouse and keyboard too), including model numbers, logos, specs, benchmarks and game stats. If you have encountered such.

Oh yes.