#!/usr/bin/python
import os, sys, random
FN = sys.argv[1]
max_size = os.stat(FN).st_size
idx = random.randint(0, max_size-1); 
sz = random.randint(0,max_size-idx)
splice = open("/dev/urandom").read(sz)
data = open(FN).read()
open("fun"+FN,"w").write(data[:idx] + splice + data[idx+sz:])