Verified by 
My apologies if you've already heard this personal anecdote, which I first shared at a talk that I gave this past August at the American Psychological Association Meetings in Boston.
Most readers of the evolutionary psychology blogs know that the threat of paternity uncertainty affects men's psyches in profound ways. Men are sexually territorial. They can respond in harsh manners if they suspect sexual infidelity. They typically abhor promiscuous women as prospective wives. They create all sorts of cultural practices that are ultimately meant to assuage their fears of being cuckolded including brutish instantiations such as chastity belts, harem sequestration, female circumcision, foot binding, and strict Sharia edicts regarding women's modesty. This is some rather nasty stuff.
One strategy used by women in allaying men's paternity uncertainty concerns is to insist that a newborn looks like the father even though objectively it is rather difficult to gauge morphological resemblance at such an early age (see the references below). Furthermore, a woman's relatives are much more likely to proclaim paternal resemblance than is the father's side precisely because it is in their best interest to establish paternal assuredness. This is a good example of the very specific hypotheses that are routinely tested within the evolutionary psychology framework. As you can see, there is nothing inherently unfalsifiable about evolutionary predictions.
A few months ago, my wife and I returned home from a visit to her OB/GYN, proudly holding copies of the ultrasound images of the growing fetus. We engaged in the customary behaviors such as posting the images on the fridge's door. My in-laws dropped by to say hello, and to share in the good news that all was going well with the gestation. Upon seeing the ultrasound images, my mother-in-law uttered without any hesitance:
Gad, the baby looks exactly like you. He has your profile!
Wait a second now. I cannot tell which species is represented in the ultrasound image (is it a lizard, a joey, or an alien?), nor can I identify specific body parts yet my mother-in-law was able to detect an uncanny resemblance between the fetus and me! Being the consummate evolutionist, I right away thought to myself: Yes! Assuaging of paternity uncertainty by my wife's side of the family! The unique point here is that this is the first documented case of this phenomenon in utero! When I shared my thoughts with my mother-in-law, she seemed unmoved by my evolutionary logic. Rather, she reaffirmed her position, and added that the ultrasound images of her other daughter's child, had also revealed an extraordinary resemblance between the fetus and the father. By the way, I do not mean to imply that the evolutionary mechanism in question is a conscious one. Rather, it is likely that a perceptual distortion takes place without any cognizance on the part of the individual who is proclaiming the resemblance.
My wife is due any day now. Let's see whom the kid will actually resemble. Ciao for now.
References:
Daly, M., & Wilson, M. I. (1982). Whom are newborn babies said to resemble? Ethology and Sociobiology, 3, 69-78.
Regalski, J. M., & Gaulin, S. J. C. (1993). Whom are Mexican infants said to resemble? Monitoring and fostering paternal confidence in the Yucatan. Ethology and Sociobiology, 14, 97-113.
