Gosh you make me want to visit Spain again. One of my last visits there was to San Sebastian. I do not know if you've been - it is a great place.
I love that t-shirt shop and the shirts you bought. It would have been interesting if you decided to wear them at the end of your trip - just to see the reaction of the people you were already socializing with.
I hardly wear t-shirt - actually I never do but I buy them as gifts for others.
PS - Scream is from a Norwegian artist called Edvard Munch. I like this fun t-shirt version too.