A hematologist pricks fingers.
On St Patty's day everyone wants to be Irish.
One you're running on fumes, the other you're fuming with the runs.
The pricks are on the outside of a porcupine.
A porcupine has the pricks on the outside.
You command vast powers beyond the scope of smaller minds, but to them all you do is wiggle your fingers and stuff just happens.
Two fingers.
It means urine business.