From imdb.com (internet movie database) page on The Horn Blows At Midnight, comment about the special effects:

"And of course the coffee pot sequence. SOME of it was clearly done with miniatures... but a LOT of it had to have been done with a full sized model of the pot (Benny falling into the cup, going down the drain tube, and being poured out of the coffee pot spout).

Didn't the Academy give awards for special effects and cinematography back then?

These guys did things that would make today's special effects folks go green with envy!"

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I don't remember ever seeing this movie, but it looks like a really great one! Jack Benny plays an angel come down from heaven. The fan comments at imdb.com are very positive.