Bittersweet nightshade. I grew up being told to keep away from these berries as they are food for the birds but poisonous to humans. According to Wikipedia, it's native to Africa, Asia and Europe but it's an invasive plant that has spread throughout the world.
Here's a picture of the berries.
Bittersweet Nightshade - Solanum dulcamara
This shirt is pre-shrunk to ensure size is maintained throughout several washes, and offers a classic fit.
• 100% cotton knit