There have been a few
I guess modifying things might have resulted from working in a windowless basement electronics repair workshop for too many years.

Memory vague but these stand out:
The addition of the beepy whistle key finder board inside the TV remote control. Never lost it again.
A cattle prod thing with paperclips that was made out of spare bits. Transformer was wound with a drill.
The sunburst wall clock that was turned into a toy robot with a wagging tongue called "Mr Licky".

Probably more
(Captain Ignorant what does this button do..., Tue 2 Aug 2016, 13:58, 2 replies)

got any pics?
I'm struggling to visualise what these look like
( Grrrmachine the indifference engine, Wed 3 Aug 2016, 13:43, closed)

I'm visualising the home-made cattle prod being used to torture abducted women in his soundproof basement

(Baggenfrock get fucked, Wed 3 Aug 2016, 19:19, closed)