Do you have good veins?

They work. Funny story but when I was about 18 I was very ill. I was rushed to hospital semi conscious. In my confused state I watched a nurse repeatedly try to put in an intravenous drip. She kept failing. The doctor grew impatient and took the needle from the nurse's hand. "I'll do it", he said. After about 6 tries he was having the same issue as the nurse. Out of the corner of my eye I saw a nun in full habit approach boldly. She grabbed the needle out of the doctor's hand and in one swift jab had the needle inside my vein. "Rolling veins" she snorted as she clomped off down the hall. The nurse and doctor looked on with bemused befuddlement.