1- Tell them you don't like their Spanish ham and they feel as if you've just insulted them.
2- They do have a nap (siesta) every day after lunch.
3- "Corridas" (bullfrighting) are for them a great show, and not an horrible, barbaric event (as I think it is).
4- They are kind of slow, they live with their parents until 30 without feeling bad about it and don't mind their parents paying them everything, if they have a boy/girlfriend they won't live together before years go by, they get married and have children very late.
5- Their TV programs are pretty bad and they only have few famous movies.
6- Spanish people are friendlier and more generous than in many countries (especially in the South).
7- Every time you ask for a drink in a pub they offer you a small dish of food (tapas)!
8- They hang out the washing under their windows, in a way that everyone walking in the street can see it.
9- They don't use Facebook but Tuenti (Spanish version of Facebook).
10- They love meeting up in a street around midnight. to drink alcohol, standing up even if it's 0 degree and you totally freeze.(botellon)
This is Spain xD
This is Spain xD

