Pretexting - An individual lies to obtain private information and/or impersonates people in certain jobs.
Phishing - Attempting to acquire sensitive information over email by masquerading as a trustworthy entity.
concepts of whale phishing and spear phishing is interesting here
Smishing & Vishing - Smishing occurs over text message and Vishing occurs in person or over the phone
Tailgating - Bypass physical access controls by following closely behind an authorized person.
Piggybacking - You knowingly allow someone to enter a secured area, using your credentials.
The USB Drop - Attackers load these drives with malware and intentionally leave them somewhere to be found.
Dumpster Diving - Criminals can find a range of valuable data and personal information in trash