Pratfall Effect

When asked to rate the attractiveness of a skilled and intelligent person

Participants rated them as mire attractive when the people committed a small blunder during the interview

We find it endearing when people who we admire make mistakes

See the full study here :

Aronson, E., Willerman, B., & Floyd, J. (1966). The effect of a pratfall on increasing interpersonal attractiveness. Psychonomic Science, 4(6), 227–228.

Want to know more about biases?

Sunk Cost Fallacy

Projection Bias

Just-World Hypothesis

The Ostrich Effect