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This is a short riddle which has a short answer.

I look like I have no memory,
but I am fine,
but turn me around
and I may knock you down.

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I think I'm missing how it rhymes, even with the answer in mind.. – Milo Price Mar 4 at 19:32
    
Cute, simple, and fun! I loved this one c: – Deusovi Mar 5 at 6:55
up vote 40 down vote accepted

I think the answer is

OK

I look like I have no memory

OK looks like 0K (zero kilobytes)

but I am fine,

OK is synonymous with fine.

but turn me around and I may knock you down.

OK backwards is KO (an acronym for knock out)

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