Scenario:
"Laptopping" with my Toshiba 5200 resting on my, well...LAP. (Whilst wearing shorts, as it is blinkin' HOT!) Enjoying the day, computing outdoors...when SUDDENLY....ZAP!! ...tingle tingle tingle... (huh??....nah...imagining things again, I am...) ZAAAAAP!! (OUCH! That S.O.B. ZAPPED me!! What the....?)
(I then check where the port-side USB receptacle was resting against sensitive inner-leg-skin...look across to where starboard USB counter-part did the same!!)
No damage at all, but I can assure you I shall NOT "laptop" like THAT again! Those USB ports carry some load of juice! WHAT A NASTY surprise!