Well, not really, but that got your attention, didn't it? Anyway, I always make my gravy with a splash of whatever red wine we have on hand. The other night we also had a bit of white left; not enough for a proper glass of wine, so I decided to add it to the gravy, which needed a bit of thinning out. The premise was: I always put wine in the gravy; this gravy is too thick; since I have to thin it anyway, this lovely white wine will taste much better in said gravy than boring old water.
Perhaps because I was mixing red & white, or perhaps not, but we decided that, yes, it is possible to add too much wine to the gravy.