Horrors of Re-Using Tape!
I think a lot of us must have horror stories of re-using a source tape only to need the original contents months, or even years later.
It doesn't seem to matter if you choose a tape that contains video that was shot years ago, and there is no possible way on earth that anyone would ever need one frame of it ever. The very moment that you record over it, the phone will ring and the client, who you barely remember even shooting for, will pay ANYTHING for 500 PAL copies to be shipped to Antarctica.
Unfortunately you tried recording a time-lapse of snow melting in your neighours backyard, which didn't work anyway, because you didn't set up the interval properly on your camera and ended up just recording an hour of realtime video of your neighbour's dog sleeping in the snow, along with the audio of you arguing with your girlfriend on the phone, and you now have to nuke the tape anyway because what you said during the argument could be used against you in court if anyone found out a recording of it exists.
If you had of just used a new tape to record the neighbour's dog sleeping in the snow, you could hand deliver the 500 PAL copies to Antarctica (which is now the only safe place for you in the world after what you said to your ex-girlfriend) and have enough money in your pocket to hibernate at the South Pole while things cool down on the home front.
But...NOOOOO!!!! you had to just grab any tape off the shelf.