The 1975 classic Jaws is currently showing on ITV. The mid-seventies hairstyles and clothes appear wonderfully naive, but the horror induced by a largely invisible and lethal menace is timeless. John Williams' chilling music followed by plumes of blood in the seawater earmark this film as truly iconic.
The Bible makes little mention of sharks. Israel was a land-lubbing nation; when apostles needed a dangerous creature with which to liken Satan, they opted for lions and snakes. A shark, however, would be a good substitute, especially the one in Jaws:
1) He is a great danger to you, though you can't see him.
2) He moves far quicker than you and with greater agility, but only when you're in his territory.
3) He seeks to kill; should you survive, you'll be scarred and injured, though probably wiser.
4) When you think he's there, he may not be. When you think he's not there, he often is.
5) When he smells blood and detects injury, he is drawn to the kill.
In the end, he's caught. Until then, Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour 1 Peter 5:8.