Depending on who you ask, there's any number of actors who've played The Joker the best.
The most common answer is most likely Heath Ledger's turn in The Dark Knight, although you might get the odd one who'll argue for Jack Nicholson in Tim Burton's Batman. You may even have some who'd argue for Mark Hamill in the animated series or even Cesar Romero in the '60s TV series.
All great actors, all great performances in their own right - and now we can add Tommy Wiseau to the list. In a video made for Nerdist, the creator of The Room tries his veiny, leather-studded covered hand at some of Heath Ledger's lines. If you told us that he provided his own costume and makeup, we'd believe you.
Take a look.