Last year one of my guys at work had his laptop on his chest and was watching some YouTube when the battery pack exploded. Although he threw it off himself in a hurry, the burns he got put him in ICU, and a stay in hospital for 2 weeks, with follow-up ops for skin grafts. He couldn’t work for 6 months.

I now won’t allow my kids to have a laptop sit in their lap, and all re-charging is done on a metal surface away from combustible materials. Seeing the batteries zinging around on fire is of concern though!