We've never seen him be so candid!

Kanye West stopped to fuel up his Lamborghini in Calabasas today, and the rapper calmly explained to photographers why he gets so angry with the shutterbugs that follow him and his family around.

The most interesting part?

Yeezus confessed exactly why he lost his temper and assaulted a photographer at LAX last July.

    "That's the day I found out my grandfather was not gonna make it. He passed two weeks later," KW revealed.

That's just one tidbit of his shockingly rational conversation... check out the rest!

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