I liked him as Big Eddie is So Fine, a vastly underrated comedy starring Ryan O'Neal and Jack Warden as well.
The one where O'Neal is boffing his mistress (Big Eddie's girlfriend) and has to escape wearing her jeans. The ass rips out and he replaces it with plastic starting a fashion craze....
Kiel is great as the monosyllabic speaker Big Eddie.
Girlfriend: Oh Eddie, maybe we could have a nice vacation, the Riviera? Perhaps Italy?
Big Eddie: Reno. Vegas.
Girlfriend:What do you mean?
Big Eddie: First Reno, then Vegas. You don't like it, tough shit.....