I kid you not! I have a mature oak tree overhanging part of my garden and today I found the sprig pictured lying on my patio. The leaves are definitely oak, but at first sight those purple berries look like a bunch of over-ripe red currants. They're not oak catkins, apples or galls. So what are they? Baby acorns? Surely not. I've never seen anything like them growing on an oak tree - and I climbed a few in my boyhood during the last century. Has anyone else seen anything like them? By the way, the oak tree in question is festooned with them.