Quote from Niles in No Sex Please, We're Skittish
Daphne: I just thought I'd follow your father's advice: a little less science, a little more romance.
[As Daphne kisses Niles, she hears a whirring and beeping sound. She looks down to his pants]
Daphne: And apparently it's working.
Niles: That would be my TestiCool 2000.