From Seinfeld: Men\Women Jokes:
"I bet women would like to know what men are really thinking: The Truth, the honest Truth of what men are really thinking... Cause I could tell ya! Would you like to know?! Alright I'll tell you: NOTHING!! We're not thinking anything... We're just walking around, looking around... This is the only natural inclination of Man! We're just gonna check stuff out."
Pic: The Jeronimos Monastery, Belem, Portugal last month