Oh and while using the "underground" (subway) be aware that some stations are inhabited by harmless birds called "gapps". Harmless that is, apart from their propensity to poop on one's head. It's difficult to remember which stations are occupied by the gapps so they tend to have announcements:
"MIND THE GAPP!"
If you hear this, it's advisable to cover one's head with, for example, a newspaper lest one get's another type of head adornment!