Do you have frequent, awkward situations, too?

I seem to have these frequent awkward situations in which I cannot really redeem myself or explain what I am doing.

E.g. # 1 – I was at Target looking at car stereo replacements. I was reading the descriptions on each box to see how it worked with iPods. Each box had a security device on it because it was expensive. A security guard walked right to me and asked me if he could help me with anything. I knew he was there because I was browsing these expensive items, but I played along and told him what I was up to. I was only there for about four minutes, but I suppose it looked suspicious that I was looking closely at the boxes, but that was just because I was trying to determine the features.

E.g. #2 – I signed in at my chiropractor’s office and I started analyzing other people’s signatures (I knew the doc was busy so I had a minute or two) that were on the sheet. The name above me was the same as mine, that is what caught my attention. The massage therapist, who I did not see, was apparently watching me and said that the doc would be with me in a minute. I knew she was wondering what the hec I was doing staring at the sign-in sheet.

Do these things happen as frequently as they do to me?
What are some situations you’ve experienced?