Blended wheatabix! love it - if for no other reason than the satisfaction of knowing others did things equally or more bonkers than me!
Oh crap!
Just remembered something I did that wasn't even for my baby!
Couple I babysat for had discovered that when fractious the ONLY sound that would settle the baby was the hairdryer at full blast! But they were going through hairdryers! So I RECORDED (on my beloved 2 tape deck boom box ) the sound of their hairdryer for 5 mins only...then created a 90 MIN TAPE that was just the hairdryer on a loop...
But thinking about it that's not the worst part, it's that due to my lack of proper equipment for doing this and only having my boombox it probably took me the best part of a day recording, rewinding to the start of the 5 min original recording then recording another 5 mins etc etc...
And it's just occurred to me OVER 30 YEARS LATER that I was a fucking idiot! And I don't mean for doing it at all...but because OBVIOUSLY what I SHOULD have done was recorded 10 mins worth then switched tapes and recorded another 10 mins in one go, then 20 mins etc...
Now I'm (still) shite at maths but this would surely have at least HALVED how long it took to make this Home made white noise tape...
That said baby hated after about 3 months btw! 
@Louisainlockdown on a somewhat related note we were the opposite and totally unprecious about what dd listened to - a decision that bit us on the ass when she started speaking and singing...you don't really want a 2 year old singing/quoting heavy rock and metal lyrics 
Fairly certain twisted sister are at least partially responsible for dds first word being "no"