Himalayan Balsam Seed pod.
10th October 2012: This is the much maligned Himalayan balsam seed pod. The seemingly innocuously little pod is actually super stressed. The slightest nudge will cause it to explode, sending its seeds hurtling through the air in all directions. Whilst the individual seeds won’t draw blood, they do sting when they bounce off an eyeball; they have an uncanny knack of successfully targeting eyeballs, and they easily find their way under eyelids.