Not sure how you are going to pull most of your ideas off.
A fair few years ago a couple of friends of mine did something similar (much smaller scale though) to their girlfriends and one of the tricks they did was leaving a trail of muddy footprints from the back door to the middle of the room. They just ended the trail there and it worked a treat.
You might be able to plant a baby monitor in the basement so when hes down there you can talk into the other end, the odd heavy breath and half heard word would freak him out.
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Battle Royalty, 2009
@Wolf_Scousemac
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