They are, probably one of the most sinister things ever.
My grandma had a doctor's appointment today, and so we had to get her down the stairs sense she needed a wheel chair to do it. Usually, an uncle of mine is here to help. Since he wasn't coming today, my grandpa was the one to hold the back, even though I offered to help. What it led to was my grandma rolling down the stairs with the wheel chair tipping onto its back and my grandpa falling down on top of her.
They seem okay, but my grandma mentioned her back hurts, and she bit her tongue, causing her mouth to bleed.
We managed to get her back up, but gah... talk about stressful...