When my husband and I moved into our current residence, we'd notice quite often that our light bulbs were burning out at an incredible rate. Our bedroom light fixture was basically just a long cable and buld hanging from the ceiling with a shade over it. One evening while getting ready for bed, I noticed that the light was flickering yet again. I was thinking "this is getting old already!" and went downstairs to get a spare light bulb to replace it. Upon reaching up to unscrew the 'old' light bulb (which I'd just replace two weeks prior), I noticed that the light bulb was literally just screwed in by a thread! So I tightened it, and it worked just fine. Knowing how my husband doesn't want to hear ANYTHING about this kind of stuff, I just kept my mouth shut. I have to admit, I was a bit perplexed as I was sure that I'd screwed it in correctly the first time. Well, stuff happens, so I wasn't too worried about it, although the thought of "others" did cross my mind...
The next night, as I was getting ready for bed again, the same thing happened. The light was flickering! Now, I'd been reading the night before for a while with this overhead light on, so MAYBE it really was burning out this time. I put my hand up to check - once again the light was just screwed in by a thread! At this point, I KNEW that something was up, but I kind of thought it was funny. I got to the point where everyday when I entered my bedroom, I'd tighten the bulb. Sometimes I'd even make comments like "oh, we're playful today, aren't we?" while laughing. Then it started with a bunch of other lights throughout the house. I don't care who you are, no one has time to go through their two storey house every day tightening light bulbs. So I said to the house "This is getting really old really fast - just cut it out, please".
Haven't had a problem since!