I have a lovely fresh scar on my left knee from when I fell the first time I rode with both feet clipped in. It happens...and multiple times to some of us. I just got my SPDs two weeks ago. Yeah, I was terrified that first ride. BF had to talk me through it after I sent a freaking-out text message to him at 1 am. I ended up riding with one regular shoe and one bike shoe (and somehow did that for 20 miles...), then tried riding around my neighborhood with both feet attached to the bike.