The group of giggling girls clustered around the noticeboard was immediately obvious when Harry and Ron entered the common room. Every so often someone would approach the board and read something. If it was a girl, there would be a pause, and then a giggle. If it was a boy, there would be a pause, and then an odd look directed at the girls.
Giving in to their curiosity, Harry and Ron joined the group reading the notice.
"Practical Muggle Technology: Are you grumpy and irritable every time you need to contact the muggle world? Does thinking about the television or telephone cause an uncomfortable ache? Come to this monthly session for those wishing to expand their knowledge and improve relationships."
As they were reading, yet another girl came up, read the notice and wandered off giggling. After a moment, Harry and Ron shared a look. Ron shook his head.
"Barmy, girls. Barmy, the lot of them."