josh darnbrough only noticed the tattoo on his back the following day .
it was the handy work of his best friend rob gaskell .
rob was getting revenge for a botched diy tattoo josh had given him .
the pair are both getting their tattoos removed and remain friends .
watch the full story on tattoo disasters , tuesday april 21 , 2015 at 9 pm on spike , sky tv -lrb- ch 160 -rrb- , freesat -lrb- ch 141 -rrb- and freeview -lrb- ch 31 -rrb- .