Good Hard Complicated Passcodes?

I need a really hard complicated passcode for my iphone. One that's easy to remember but hard to guess. There's this kid who can always guess them even if there about like my favorite things. Recently he got into my phone and read through my diary. So I need a really good passcode that he can't guess. It can't be anything about me because now that he has read my diary he knows EVERYTHING. Please help and don't say its up to you and stuff because i've been thinking about this for 3 days and still can't figure out a good one.

Date of special event. Besides birthday.

Pick a 4 letter word of something you see in your bedroom everyday (lamp, door, xbox, desk, shoe) anything that you see everyday so that when you see it you can remember your passcode. Pick the number passcode and put in the numbers that correspond with each letter. So LAMP would be 5267 or DOOR would be 3667.

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