Today I...

... went to work, and went for a walk in the woods.
I preferred the walk in the woods.

This is 'Milkmaid', or cardamine pratensis. It has lots of other names such as lady's smock or cuckoo flower, and a long history, mentioned by a 16th century herbalist and featuring in 'Loves Labours Lost'.

Myth has it that if you pick it you will generate a thunderstorm...