Like any summer blockbuster worth its popcorn, Poseidon doesn't waste time on fleshing out characters and simply gets on with sweeping them away with a deluge of crowd-pleasing (and admirably unflinching) special effects. Wall of water turns floating holiday resort upside-down; extras get to spend ages in what-a-horrrid-way-to-die make-up and set designers have a field day. Oh yes, the dialogue is bad - here's an exchange between two characters to prove it: "How bad is it?" "It's very bad."