What does this below rebus puzzle mean?

Rebus Puzzle Definition: A rebus is an illusion device that uses pictures to represent words or parts of words.
What does This Rebus Puzzle Identify?

Below rebus represent famous DiCaprio movie. Can you name it?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

What does this rebus mean?

O
N
C
E
TIME

What Deficiency does the below rebus represent?

VIT_MIN

What does this simple rebus mean?

Can you solve the photo plexer logic ?

Can you identify the hidden rebus in the image below?

What does it mean?