Hi there--I thought I'd add my two cents (or pence!)to the topic of triggers for missing home. Going to the cinema and watching American films definitely makes me feel a little homesick but also quite warm and fuzzy to have the familiarity of the actors, locations, etc.
Reading the Metro on the Tube every morning can also trigger homesickness when I read about events in the States. For example, I was in the UK during Sept. 11, and that was probably one of the worst times in my UK experience, as it really hit home that I was away from my family and had to read about everything that was going on "at home" but not be able to get there because airports were shut down, etc. I bought the papers everyday and went through a lot of emotional stress of wanting to be home with family but thankfully my partner was very nurturing and sensitive, as were his family.
I have to be honest though--I have taken to watching American sitcoms that I would never have watched at home, but that remind me of home. For example, Paramount Comedy plays American sitcoms all the time, and of course, Sex and the City is a must-see for me because it reminds me of home, seeing NY, etc. *blush*
Anyway, a lot of the triggers for missing home are also things that have made me appreciate things in the States that maybe I didn't realise were such a big deal in my life until I left. On the other hand though, when I am in the USA there are things that trigger missing England as well.
Whew, well I've ranted long enough.
Thanks for listening!