>Exept that's not what "racemic" means. All racemic means is "50/50 L and R", not "L and R spontaneously flip". Actually, that flip is pretty much impossible without something there to catalyse the reaction.
I think it's quite common for enantiomers to flip. For example, get some fresh caraway, and note that it smells *very slightly* like spearmint. Then leave it in a jar for a year or two, and note that it now smells rather *strongly* of spearmint as some of the s-carvone has become r-carvone.