Yes, in Oakland, CA. Two guys came up behind me and hit me on the side of my head, knocking me to the ground, breaking my glasses. Then, while I was still on the ground, they hit me again, and one of them said, “Wallet!”. I was dazed, groggy and confused, and couldn’t see clearly, so I just handed him my wallet. Then they hit my head again, just to make sure I stayed down.
There was $240 in my wallet (never again would I have more than $100 in my wallet, and nowadays much less), but nothing else. I always kept my credit cards, keys, and ID elsewhere.