"Red John zaps them with his trusty stun gun."

In episode 1, this is said by Brett Partridge, while he points an imaginary tazer at Lisbon, who is standing in front of him. (He is reenacting the murder that is being investigated)

Exactly 6 seasons later... Lisbon wakes up in hospital and she reveals the only trauma she suffered from Red John is a tazer burn.

I just thought that was weird.