WARNING: Spoiler Alert - So what do you think really happened at the end?

Well yeah Nolan purposely did that to make you wonder. to keep that really awesome feeling at the end of the movie and have the audience on the edge of their seats to the last second. it really is possible because after all they said that you have to remember how it began and you can be sure if it's a dream and we never saw how they woke up. but l'm thinking eventually the sedative would wear off and they'd be fine. Either way you can never know for sure unless you're Chris Nolan himself

I like watching complex movies. And my take on the ending is that Leonardo's character, Dom Cobb, is in reality. There are so many evidences to prove that, but i'll only mention a few. The first one is his children, James and Philippa. Although you guys might not have noticed it, but they DID age a little. If you look up the casts they used for the two kids, they used two actors for each of them, respectively. And besides that, his children wore different sets of clothes while they were in his dream. To be specific, Philippa, while in Cobb's dreams, wore an all-pink dress. But at the end of the movie, she is seen wearing pink overalls with a white undershirt. James on the other hand, is wearing a brown themed striped shirt, but at the end, he is wearing a white themed striped shirt. The changes are subtle, perhaps to make the outcome of the ending less obvious. And the strongest evidence that Dom is in reality is his totem. Please don't be fooled my fellows. His totem is not the top..it's his wedding ring. The top isn't his, remember? It originally belongs to Mal. And Arthur said you can't trust your totem once a person other than you knows the tactile details of your totem. The only reason why he keeps on using it is because it reminds him of Mal. If you guys observe carefully, he is wearing his ring everytime he is in a dream. But he doesn't have his wedding ring when he is in reality. Do notice that at the end of the movie, in which he spins his top, he is NOT wearing his wedding ring. Sorry for the long postb

I loved the ending. Annoyed that Nolan didn't show us what really happened, but loved it anyway. Now that you pointed out those things, I also think he was also still dreaming. There was also some dialogue that seem to suggest this, like when he visited his father (or father-in-law? Michael Caine?) in the University and Caine told him to wake up to his reality. Maybe the whole movie is a dream because in the real world, stealing something inside someone else's dream and planting an idea within a dream are not possible.

i hate when movies end like that when it just leaves you wondering. i feel like maybe he wasnt dreaming and finally got to go home but who knows.