When you meet the guy who takes you to the boiler room go through the air vent.
You will see a fat old man with a golf club, get him to join you but don't go back to the boiler room.
There will be another open bit round the corner where there is an old woman.
Get the old guy to follow you and the old woman turns out to be his wife.
Get your camera ready because they run up to each other and kiss.
When they kiss take the picture and will should get lots of PP and 1 or 2 achievements.