Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
Phillip Seymour Hoffman says "there are frogs falling from the sky" using his best "Spielberg Face" and then we see millions of frogs falling from the sky. They're all fake, I'm sure, but there certainly are a lot of them. It looks like they modelled them after bullfrogs, and one falling frog might be a live bullfrog. They probaly used the same ones over again for each scene, but along with some great sound design, the effect is very powerful and impressive. A car crashes on the frog-slick street, then an ambulance, and blood marks the spots where frogs landed. From high above the city we hear a bullfrog call and a squeaky sound then we see a frog fall through a skylight as we fall right behind it. It lands on the gun of a man trying to shoot himself in the head just as he pulls the trigger and ends up shooting his television. Probably a better choice than killing himself, anyway. Another falls in the face of a guy climbing a telephone pole knocking him face first into the ground. Then everybody lives happily ever after and Amy Mann comes on singing "Save Me" which became a big hit thanks to this movie.
( A plague of frogs is a motif from Exodus 8:2. The frogs are one of the plagues that visit Egypt when God is trying to convince Pharaoh to free the Israelite slaves. But they don't rain in the bible, they came out of the rivers and ponds and infested the houses and food of the people, then they all died and stank. And that was only the first of several plagues that failed to convince Pharaoh.)