Do you ever have someone of the opposite gender repeatedly come into your mind?

Why would someone randomly come into your thoughts when you are not in a relationship with them and never have been? And at no apparent time or reason. Doing laundry or driving or talking to someone and BAM! There they are, in your head. It is quite strange to say the least. Would you say this person is losing their mind?
Updates:
- I found out that the World's Largest Breasts is Maxi Mounds with 62MMM though Chelsea Charms claims she is the biggest on a U.K. show called "this morning". So whenever I see a soccer ball, basketball, watermelon, inner tube, etc. I think of those two women. https://www.YouTube.com/watch?v=nvfc93n_By0&feature=related
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