I can't think of an example of something that I am not sure is pseudoscience or not. There are a lot of interesting scientific 'facts' that I've heard (and probably passed a long) and later wondered if they were true or not. Of course, I can't think of any at this time :) But, if they were said to me, then I pass them along in conversation, then that person says it to another and so on, I can see how little science 'rumors' or pseudoscience could lead people astray. It seems like this happens often with nutrition. Fad diets are a good example. One week doing diet 'A' is the best thing and next week it's diet 'B' that is actually the right one for you. I can see how it would be hard for a person to determine what is actually right when the media is bombarding them with so much information.
**EDIT**
I thought of something that I am not sure is real or not. Wrinkle cream. Though, I cannot decide if I really am not sure, or if deep inside I don't believe the commercials I see but am just holding out hope that something like wrinkle cream could really work. I think it is probably the latter of the two......