During some practical school training (basically two weeks where pupils are send to work in companies full-time without pay) at an electronics shop, someone brought in a Windows XP machine that caused problems. Heard that sound so often...
Turned out they still ran it without any Service Packs. Windows Update also refused to work… and it was registered to those fine people called "Skidrow" (the cracking group). 😅
At that time those registration cracks already supported Windows Update, they should've updated that one!
I remember the funny lines on the back when I accidentally bumped into the tower or had the subwoofer on as it was burning.
Also holding down on the close-pin on a discman (so it would keep spinning the disc) and differently coloured sharpies were a great way to colourize your collection.