You didn’t seen anything…you saw it….’seen’ usually follows ‘have’ as in ‘I have seen’…
‘I seen’ make you sound like you are from the backwoods of Missouri or Arkansas or any other area of any other state that you make fun of in your area of the country.
Incorrect usage:
‘I seen that yesterday.’ should be ‘I saw that yesterday.’
Correct usage:
‘Did you see the news?’
‘I did not, but I have seen that before.’