I'll bet it has something to do with our personal physical makeup, or it would happen to everyone. My wife has never been zapped, or have quite a few other people I know.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K