The only time I've had to reformat my current laptop was to do some crazy experiment on trying to create a Hackintosh with my hardware that required me to create whole new partitions for it. Ending result was that it did install but it was so useless that it was not very practical. Wound up wasting a weekend on that.
There was this one cat that attacked me unprovoked when I was 5 years old . I had several scratches I had to tend to myself (after all, minor injuries shouldn't waste my parents time at all).