^ The way he said it is actually a valid pronunciation, and was actually the US standard of pronouncing the giga- prefix.
Huh. Did not know that. I'd always heard that Lloyd just got it wrong.
(Growing up hearing "jiggawatt," I had, as a kid, assumed that the BTTF writers had – as clever sci-fi writers – made up a unit, much like Star Trek's "gigaquads" for measuring computer storage. I knew what a gigawatt was, but it had never even occurred to me that they were supposed to be the same thing. It was slightly disillusioning when I got older to find out that was the case.)