In "Uncertainty" a young couple's lives have different paths to take based on the flip of the coin. But they don't tell us what this coin toss means or its significance, so we don't get to understand its implications or consequences.
The young couple is played by Joseph Gordon-Levitt and Lynn Collins. Gordon-Levitt is a talented actor and is good here, but he's better than the character. We are given no reasons to care about these characters and we know so little about them it just makes everything less interesting. I don't know much about Collins, but from this all I can gather is that she only knows how to play sexy. I would like to think that Gordon-Levitt would pick girlfriends based on more than just sexiness.
"Uncertainty" is supposed to be an interesting examination of lives travelling different ways, but the plot devices used are so lame that the two stories are just uninteresting. It is shot well for its low budget, but one should be wary of watching movies written without a script.