Sometimes there is an interesting effect when you convert a question into a statement, though this does seem somewhat modern. For example,
What the heck.
as opposed to
What the heck?
What the heck!
Or consider this statement:
Clearly this (non-) punctuation (along with the aggressive-looking formatting) has a very different, almost passive-aggressive, effect than
Would you please show your respect ...?
What is the effect by which we modify the meaning of a question by changing it syntactically into a statement?