Thread Warning ?

[TimberFloorAu]

Without changing permissions, and creating additional usergroups. Is there a quick method we can apply to specific threads, which on "opening thread" for first time, pops up a warning, that you enter the thread, that may contain adult content , and is cookie based ?

Reason I ask, we have a few threads, where specific banter/chat can get riddled with some minor swear words, and so looking for an option/warning system.

Ste