Medical Injection Puns

The doctor's office was associated with the local medical college, so there were a couple of med students watching the senior doctor work on my son's toe. He loaded up a syringe with anesthetic and injected in multiple places, explaining that he was doing this to achieve digital blocking (that is, numbing the entire digit, namely the toe).

After it was done they left the nurse to bandage my son up, and he said, "Dad? What did he mean by digital blocking?"

"Well, when you weren't looking he hooked your toe up to a USB port and downloaded some MP3s into it. If you hold your foot close to your ear you can hear "Laaaaa, aaaaa aa aaaaah, close to you.""

The nurse stared at me and turned to my son. "Is he always like this?"

He silently nodded, looking at the floor...