Schadenfreude

Definition here.

Let's use it in an example:

Heather experienced schadenfreunde when this glorious UK summer weather was cut short by an impromptu rain shower, as it forced her neighbors to take their stereo and their cigarettes inside, as our rooftop terraces are uncovered.

After three hours of listening to their trance music at a volume that could be heard inside her flat, with all doors and windows shut, and earplugs in addition, this unexpected rain was most delightful!

Granted they are students and it is a Saturday afternoon, so their behaviour, while chavish, is not out of line. As they are young people, they will bounce back from this misfortune and hopefully re-group in a bar down the street.