a drunk father-of-two faces hours of agonising laser surgery after mis-spelling his own son 's name into his arm .
but instead of the letter ` l' , mr moffatt started needling , was meant to ink ` riley ' - the name of his four-year-old son - into his left arm .
he also attempted to mark himself with riley 's nickname ` sonny boy ' - but ended up scratching ` sony boy ' instead .
the makeshift tattoo session took place in mr moffatt 's living room with a £ 70 ink gun bought online .