Rat Pfink and Boo Boo (1966)

It starts off seriously enough with three thugs robbing an innocent young woman at night in the city, then switches to Vin Saxon and Carolyn Brandt doing a goofy Elvis-like rock 'n roll number (very charming, though). The next day the thugs are bored. Picking a name at random out of the phone book, they decide to terrorize Carolyn Brandt. After some campy dramatic scenes, the goons kidnap and decide to ransom her. After receiving the ransom call, Vin Saxon and the good-natured but not-too-bright gardener sit around despondently, wondering what to do. "There's only one thing to do!" exclaims Vin. The two rush off into the next room and become costumed heroes Rat Pfink and Boo Boo.