Ron Swanson can sense Tammy’s evil presence.

Ron Swanson:

“Look, Tammy and I don’t work. We are oil and water. Or oil, and TNT, and C4, and a detonator, and a butane torch. Nothing good will come-”

(Ron interrupts himself)

Ron Swanson:

“Wait…”

(Alarmed, he stands up and looks around his office)

Ron Swanson:

“She’s here, isn’t she?”