You're lost in the wilderness (which, these days, qualifies as anywhere without 4G). Night is drawing in and you're getting faint from hunger, your last Mars bar scoffed hours ago.
If you were Bear Grylls, you'd rustle up a three course meal from the nearest ditch. But you're not Bear Grylls - he doesn't get lost. You're an idiot who "knew" that turning left at the stream would be a quick short cut.
In the exceptionally unlikely event that you should find yourself in the above position, the following infographic will be of immense use. Assembled by the boyscout minds of UK Oak Doors, this guide provides a helpful set of tips on what sort of plants you best avoid eating (pretty much all of them) and which you're safe to nibble on.
Now, who's for a lightly tossed salad of miner's lettuce and lamb's quarters?