1) The Germans called them "Janus-words," after the ancient Roman god patron of beginnings and endings. They are words that have developed contradictory meanings.
2) Colloquial expressions like Estar como una cabra, Tirar la casa por la ventana, Mas cara que espalda. Off your trolley, To push the boat out, To have a lot of cheek.
3) Language curiosities and a cheese-related Limerick ;)
Music: She Said, Plan B / All About You, McFly / Bye Bye Baby, Bad City Rollers.