I_should_have_known -

: Questions range from the location of UCLA to keyboard shortcuts for saving documents. 2. Music: Notable Songs

Depending on what you're looking for, "I should have known" (or "I should have known better") likely refers to one of the following popular topics: i_should_have_known

This is a popular fast-paced trivia game where players are asked questions about things they ideally should know the answers to (e.g., "Which way does a fan turn?"). : Questions range from the location of UCLA