(In case you're not aware, one of my best friends, Rynn Miller, is living here in London with me.)
With only two people travelling together, we rely on strangers to take pictures of us quite often. Rarely, if ever, do they do a decent job, to say the least. Usually, we ask them to take a picture of us in front of some monument or attraction or something, and they can NEVER get both us and said attraction.
Here are a few examples:
Please take our picture with the massive lion?

I was standing up here and Rynn was going to take a funny picture of me for an inside joke with Kory, until this man insisted we both get up there and he take a serious picture of us. Really beautiful backdrop right?

This one is taken in Oxford. We are near a really cool pub, awesome streets, the city walls...but no, we get wall, fence and empty kegs instead. Awesome.
We were in Scotland on a trip to see Loch Ness and we saw another group's tour guide all decked out in Scottish gear--kilt and all. So, being the unashamed tourists, Rynn and I went to go take a picture with him. One of the guys in his tour group took the picture for us. We weren't really interested in seeing his lovely blue button-up shirt, silly! You can't even tell he has a kilt on unless you're really looking for it. Ugh.
This one probably takes the cake as the worst picture ever. First off, this man had no idea how to use a digital camera so he kept holding it up to his eye to look through the little viewing thing. Then he waited so long to take it that the camera went on stand-by so he thought it was broken. Next, he took several pictures of the ground trying to figure it out. All this time, he left Rynn and I squinting into the incredibly bright sun without ever telling us when he was going to take the picture. Also, this is taken at the amazing Edinburgh Castle...so we've got a castle in one direction and incredible views of the city in two directions...but we got trees, a fence, a shadow and two very unprepared girls. Thank you very much sir.
SO, because of this, when some random person asks me to take their picture, I take my time and do a FANTASTIC job! I put a lot of effort into it because I know the feeling of defeat when you check out the picture that night on your way home and realize they failed, yet again. Oh well, I guess they do make for pretty good stories!