No matches on prints, DNA, dental. Clothing is custom, no labels. Nothing in his pockets but knives and lint.

While many believe the hospital explosion in The Dark Knight to be a mistake,

it was actually in the script, and expertly handled by actor Heath Ledger.

However, the moment where The Joker is apprehended and mockingly claps

to congratulate Jim Gordon 's promotion was not.

Nolan encouraged the crew to keep filming, which resulted in just another amazing scene

featuring the character.

Midnight Cowboy didn't have a huge budget,

meaning the crew would often have to film in locations that were not staged.

For example, on actual city streets.

The famous scene resulting in the " I 'm walking here " line was improvised by Dustin Hoffman

as he was almost hit by a car during the shoot.

" Hey, I 'm walking here! I 'm walking here!"

He says he was more upset about almost losing the take,

but ended up playing it off in character, resulting in the memorable line.