My group isn't fond of psionics, but we have one player who loves them and asks to include them in every game. Finally, we agreed.
For the first two sessions, he used 'detect hostile intent' on every single NPC encountered, at every single interaction. No matter how friendly they seemed.
Then the PCs were called to a war council with the King. There was a knock at the door, it was one of the courtiers, who proceeded to walk into the room, draw a poisoned knife, and fatally stab the king.
Guess who forgot to detect hostile intent?
(You probably aren't looking for anecdotes, but I couldn't help but share the memory. Whenever I hear psionics, that's what I think of.)