[REQ] Question based lockscreen

[Guest Deoxyribonucleic_Acid]

I was wondering if there is anyway that instead of a pattern, pin, or password. I could have my device ask a question (randomly chosen from a predetermined list), then multiple choice answers. Get it right and you get into the phone.

I was thinking about using it as a revision tool, not much I do more than unlock my phone, and it fits with the short bursts of information we're 'meant' to revise in.

I didn't know if something like this already existed, or if it is hugely difficult to code. I've dabbled in bits of code, but the android SDK has scared me off :L. I'll stick to my frankencode.

Thanks in advance

DNA