While crossing on the ped/bike marked crosswalk once I had the green, a car rolled slowly forward, and forward, forward until it fully blocked my line of travel. Car ended up completely blocking the crosswalk as I stopped and watched. Once it stopped, I leaned forward and knocked on the passenger side window, "knock-knock." The girl (high school? College?) jumped out of her skin, nearly dropping her phone into which she had been texting. She unrolled the window, I said, "You are completely blocking the crosswalk!" She looked at me funny for a second before realizing what she did, apologized profusely and backed up - without looking behind her, she's lucky no one was there - before I could tell her to stop texting. If I hadn't been watching vehicles I would have been squished while she texted her little heart out.