Land sharks and giant spiders

I wonder... How would our lives change if we weren't top of the food chain? What if we were hunted by land sharks or picked off by giant spiders?

I reckon our crappy days at work wouldn't be so bad. Who cares if the boss yells at you... at least you weren't devoured on the way home.

I wonder because i stroll into some pretty irksome places whilst reading water meters. If man eating spiders did exist, i figure i would quickly be consumed.

Nothing could beat death by paralysis, having my innards turned into goo and then hypodermic consumption.