I think this has been done before, but since I had so much fun with this recently in real life...

let's see.

I am a Czech and I:

summertime stereotypes:
1) When I take vacation at the seaside I will swim in the sea even if it's cold outside or there are big waves. I've been saving my money the whole year for the sea, so I am gonna damn well enjoy it, even if I am the only person swimming.

2) I like beer. And last time I was abroad I found myself complaining "I don't like the beer in this country."

3) I DON'T!!! wear socks in sandals. I DON'T! wear my worst clothes when going on vacation ("nobody knows me here and i am not gonna damage my good clothes" goes the argument of my fellowcitizens). I DON'T use a plastic bag from a grocery store instead of purse or regular bag.

4) I convert the prices in my head and think everything is expensive.

other stereotypes
1) I am constantly in "so much hurry". I run on the escalators.

2) I talk politics mostly in angry manner.

3) I joke inapproprietelly. About everything. Cause nothing is funnier than wars and natural disasters. At the same time I follow several human rights org on my facebook and donate money and stuff when something happens somewhere.

4) I get very offended when mistaken for a Russian.

5) I like to talk to foreigners about our horrible, tragic history. I often explain this history is a reason why we drink so much.

6) I shop at the vietnamese markets a lot.