Thunder and lightning always happen at the same time.
Storms start instantaneously: there's a crack of thunder and lightning, then heavy rain starts falling.
Heavy rain causes no loss of long-distance visibility.
Everything is blue at night-time.
Caves always have flat floors, and it's never fully dark.
There is always someone in the canal or the storm drain when the flood hits.
The moon is always out at night (except for those cheaper movies where the sun is still out..).
Full moon can occur for several nights in a row.
Eclipses happen frequently, and without any warning.
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Back to Movie Cliches.