I found this sign at one of the gusuku (castles) in Okinawa a few years back.
いっちぇ〜ならん！
Iche~naran!
Do not enter!
At a construction site near my apartment in Fukuoka I found this warning:
危なかけん (Abunaka-ken)
入ったら、(haittara)
いかんとばい (ikanto-bai)
工事しよるけん (Kōji shiyoru-ken)
立ち入り禁止ばい！ (Tachiiri kinshi-bai)