I was walking down the hallway in my apartment, when suddenly, WHAM! Nine pounds of kitty flying at a significant fraction of the speed of sound (if not of light) hit me in the ankle.
It felt like getting kicked in the shin. Owwww. I think I might put up some kitty speed bumps in the hall…
You’ve been around long enough to know you’re supposed to provide a photo of the aforementioned Evil Kitty. Another violation of this policy will not be tolerated.
My daughter’s cat used to body slam her as she emerged from the hallway. There’s a great ambushing spot there. He’d wrestle with her too. He was an only cat at the time. Now that we have provided him with two other cats, he wrestles with them. And they wrestle back. There’s a great deal of ambushing and chasing that goes on in this household, as well as a great deal of sitting in boxes.
This is why, when I come home from work, I always tie some metal trash can lids to my shins. They’re noisy and bit uncomfortable for sleeping, but when the cat runs into them face first - WHAMMO! Just like in the cartoons.
So overall, the benefits outweigh the costs.
She looks like she’s about to ambush you in that photo! 
I had a cat, Dorothy, who used to ball up her little fist and punch me in the nose sometimes. Hard, too!
My cat used to hide under the bed and wait. I’d be walking around, getting ready to go to sleep, and still she’d wait. Just as I was about to get into bed, she’d leap out, grab me around the ankle with both her little paws, and bite my foot. She wouldn’t do this every night. She’d wait long enough between attacks so I’d let my guard down, to acheive maximum scare each time.
Over which you will doubtless trip in the dead of night and the fog of half-sleep. Six of one, half-dozen of the other, really. In general it has been my experience that cats take perverse pleasure in causing pain and feigning complete innocence about doing so, including but not limited to:
But y’know, we love 'em anyway.