You know you're watching Criminal Minds too much

When you figure out that Spencer was born after December 22, 1984 because in an episode in S1, Spencer mentions the Geotz NY Subway shootings and Gideon says he wasn't even born yet.

Then you realize someone writing the scripts apparently didn't do their homework cause in the same episode Spencer says he's 24. Season one was in 2005 meaning he would have been born in 1981.