THE KNOW-IT-ALL

As real estate agents we have all run across this person at one time or another, the know-it-all person who is offering advice to a home buyer and obnoxiously purports an expansive comprehension of a topic and/or situation when in reality, his/her comprehension is inaccurate or limited.

Today -- my MR. KNOW IT ALL told my buyer that the house she wanted to purchase was suffering from major structural defects based on this:

Anyone  else have good "KNOW IT ALL" stories they would like to share?