In the 1st ODI between India and Pakistan in 2004, Rana Naved-ul-hasan conceeded 17 runs of 1 legal ball. He was a new bowler at that time and almost forgot how to ball when he over stepeed 5 times in an over. Sehwag murdered him for four fours in that over adding more woes to it.
The whole over looked like this: 4nb,4nb,0nb,0,4nb,0nb,4,2,0,0,1
He conceeded a total of 24 runs in that over and 17 runs was scored of legal 1st delivery .
Here is the video of that: