It most definitely is! At least for this bloke on a tram in Hanover earlier this year. He was just chuckling away over his book, and it was pure fun to watch him, and then the slightly irritated people around him, who didn’t really know how to react, or if they’d need to react at all. He didn’t notice anything of that, he was simply lost in his own little bubble. A pleasure to see someone getting so happily excited about some written lines and not really caring about anything going on around him.
Reading is fun!