I liked this because the post started off very much like one would expect a charity plea, in fact the request for £2 a month echos the well-known charity Oxfam and their plea to help children in the developing world. This is especially enhanced by the description given of 'little Timmy' and the hardships which he has to endure every day, which evokes feelings of sympathy tinged with sadness, and also engenders a willingness to contribute to assist little Timmy in his endeavours.
Then, when I scrolled down to see the bottom of the post, I saw that in actual fact, instead of being a plea for charity, the post was discussing the sale of a hypothetical video of Timmy for the price of £2, I then pictured in my mind what the actual actions of Timmy would look like, preserved in the medium of video and found the thought of this very amusing. The amusement was enhanced by the realisation that the initial description designed to engender sympathy were deliberately misleading, to maximise the contrast in emotions between sadness and symapthy to pleasure and hilarity at the video of little Timmy.
Overall, I appreciated both the juxtaposition of charity and humour, the element of surprise as well as the visual imagery provided by the description of little Timmy and the video, which I found amusing and so smiled, although I did not laugh out loud.