I got 'vaccinated' for Chickenpox back when I was 6 in El Paso. That involved my mom inviting a neighborhood mexican kid to stay the night who was sick with it... and that meant the rest of my siblings & cousin caught it, too. I remember it sucked, but I really don't remember the details other than the uncontrollable itching all over my body.
Fast forward 30 years, and my little brother Jim caught Shingles, and he says it was THE most horrible sickness by far that he's ever experienced. He was in agony.
I probably should go get that vax. I've seen him with the flu on his deathbed and he fervently will tell you that Shingles was much, much worse.