Cheese?

I really have no IDEA what to make of today's happenings.
This is going to sound ridiculous, but I think the people at work thinks I stole some cheese...
Here's the story:
Once a month, our company offers us a free braai (A braai is like a barbecue), which is absolutely awesome in my books. With the end of June's braai, my colleague purchased a block of cheese which we didn't end up using, and it was to be kept for the coming one at the end of July.
Within the last 2 weeks I have even temporarily forgotten about the cheese, until today...
All of a sudden, out of the blue, I get told that we are having a braai today. Besides the fact that this is not the right time, I also didn't get the usual invitation as is customary. It was just sorta "sprung" on me. Then all of a sudden they ask me if I know the cheese is missing. I said no, cause of course I didn't know the cheese was missing, I mean who the hell thinks about the cheese at work all the time?
OK, now as petty as this all may sound, I seriously think people are trying to set me up.
I was told before the braai, when I asked why we are having one, that the boss wanted to tell all of us something and he wanted it to be in a relaxed environment. The boss didn't make any announcements whatsoever during the braai... that's odd.
The cleaning lady also didn't come in today. I bet she was told not to come in cause they think if they confront me I would try to blame her. You know, even if it WAS me who took the cheese, I would NEVER shift the blame. Never, cause I would never want anybody to do the same to me...
Another of my colleagues was "sick" today, I think she's in on it? They used her to test my reactions, I'm sure, cause they kept on making jokes about her taking the cheese, and then looking at me, even though everybody knows she's been there the longest and would also never do something like that.
My other two colleagues made a point that they would never need to steal cheese as they stay with their parents, who buy them cheese when they need it. I just kept quiet, cause I really had nothing to say about it.  Anyway, as a matter of fact, I don't believe that ANYONE of us would steal anything. I mean, why? There's just too much risk involved.
Anyway, I know you might not completely understand why I think they think it's me. There are many other weird things that I can't put into words right now.

First of all, me and my husband buy our own huge block of cheese once a month, so WHY THE HELL would I bother with cheese at work. PLUS if our cheese runs out, we just buy more. If it gets to a stage where our salaries are no longer enough to sustain our living needs, I will LOOK FOR A BETTER PAYING JOB, not sabotage my career by stealing a stupid block of cheese! Arrrgh, this is all very frustrating. I have recently completed some studies, after having a late start, and am still in the process of bettering my qualifications. I have a career path I want to follow, and I am just starting out. Why would they think that I would ruin it by doing something so childish?
And why play all these mind games? Just come out and ask me! Or maybe, they want to make life unpleasant for me so that I will quit, cause maybe they don't like me. I do come across as anti-social, but that's cause I'm shy, but that doesn't mean I don't like you. I have the greatest respect for every one of my colleagues. This is one of the best jobs I've ever had. I don't understand why all this is happening right now... I REALLY REALLY hope that this is all just in my imagination. I don't feel happy at all...