S05 E07 - At the End of the episode, PJ bumps into Robert(Bob) Kirkland:

BK: Sorry mr. Jane.
PJ: Do I know you?

BK: No...but I know you.

then he smiles and leaves.


S05 E08 - Lorelai tolds Patrick:

PJ: I am nothing like him..
L:  How would you know?  I know!

L:  I only wonder why the TWO of you didn't become life long friends
    the moment you shook hands. [S05 E07]

Then at the end of the episode, after PJ crashes the car, he can hear Kirkland, who give some instruction on the radio.

PJ makes a weird face and ask Lisbon:

PJ: Who's that guy?
L: Don't talk, help is on the way.