The other day I nearly stepped on a grass snake (Natrix natrix). Luckely I didn't and for once the snake didn't dissapear straight away. It stayed for a few minutes, meanwhile I took the opertunity to take some pictures of it.
If I would have known parselmouth (snake language in Harry Potter) I would have asked what this snake was thinking when it looked at me with its evaluating eyes. Friend or enemy? Then off course I would have apologised for nearly stepping on it.