My family’s visit to Loch Ness ended with a literal bang, but — as the headline might suggest — not quite the bang we had hoped for. It all started early Thursday morning, when we left Edinburgh with my dad at the wheel of a Mercedes wagon after Gui apparently charmed the lady at the rental car desk into a free upgrade. Notably, that wheel was on the right side of the car instead of our accustomed left, which explains why my dad initially hopped into the passenger seat when we prepared to set off from the parking lot. Americans…