General Pattern lock screen question!

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http://androidforums.com – I had my phone set to have the pattern lock screen on. I went to take a shower, came back and my phone no longer had the pattern setting on it when I went to enter into my phone. (yes, someone else was in the room too) Is it possible for someone to take that off your phone somehow? I'm feeling very uneasy about it... I know these things don't just magically disappear. This person insists they didn't do anything, but I find it hard to believe. I tried to "hack" into my phone to get around it and I couldn't find a way. Someone help me figure this out! (General)