Analysis of Momento

There are many ways in which we can tell that Momento is a thriller.

Starting from the end
What Momento does that most thrillers do is that they start the end from the begining the reason why they do this is because to leave suspense and keep us as the audience clues to what may happen later in the film e.g. the first scence is of the man with a gun to his head and makes us want to know why is this?

Clues

Like most films in the opening title sequence the directors try use clues to make us as the audience understand the film and how the clues may help us