"I tried to think of the most harmless thing . . . something I loved from my childhood," Stantz mumbled. "Something that could never, ever possibly destroy us. Mr. Stay Puft!"
"Nice thinkin', Ray," replied Venkman.

Yargle and Multani

Secret Lair Drop

"I've heard much about you from my daughter," Multani rumbled. "There was a time when I'd balk at your aid, phantom, but she has shown me the merit in Urborg's strange ways."
"Gnshhagghkkapphribbit," replied Yargle.