Scientific paper quote of the week(?):
“… it is usually easier to assess reliability than validity, and it is tempting to hope for the best if the results are reliable.
An everyday example of this is the Father Christmas effect. if a number of respondents are separately asked to describe Father Christmas, then their accounts are likely to agree closely (white bearded man, somewhat overweight, in long red coat and hood with white trim – probably a more detailed description than many crime reports).”
– Rugg, Gordon, and Peter McGeorge. “Questioning methodology.” Work Paper 99.03 (1999).
Source (original publication)