der Aufreger
controversy / hot topic
A topic, person, or event that causes anger, outrage, or a heated public discussion.
Die neue Gebührenerhöhung war der größte Aufreger der Woche.
The new fee increase was the biggest controversy of the week.

controversy / hot topic
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controversy / hot topic
A topic, person, or event that causes anger, outrage, or a heated public discussion.
Die neue Gebührenerhöhung war der größte Aufreger der Woche.
The new fee increase was the biggest controversy of the week.

'Der Aufreger' (controversy/hot topic) is derived from the verb 'aufregen' (to upset/excite). The ending '-er' turns the action into a thing or topic that causes this action, that is, the getting upset.
Die Entscheidung des Schiedsrichters war der große Aufreger des Spiels.
The referee's decision was the big controversy of the game.
This word belongs more to colloquial language and media language. You would find it less often in formal or academic texts.
In den Nachrichten wurde über den neuesten politischen Aufreger berichtet.
The news reported on the latest political controversy.
Common phrases are 'der Aufreger des Tages' (the controversy of the day) or 'der Aufreger der Woche' (the controversy of the week). It often describes a topic that briefly causes a lot of public discussion.
Das Interview mit dem Politiker war der Aufreger der Woche.
The interview with the politician was the controversy of the week.
scandal
'der Skandal' and 'der Aufreger' can both describe a topic or event that many people discuss angrily. 'der Skandal' is more serious: it is about something considered morally or legally wrong that causes public outrage. 'der Aufreger' is more general and often a bit more colloquial. It refers to something that is currently causing anger or a heated discussion, but is not necessarily truly wrong or illegal. Learners may confuse the words because both have to do with outrage. If it is about serious misconduct, you are more likely to say 'Skandal'; if the strong reaction is the main focus, 'Aufreger' fits.

Die neuen Parkgebühren sind morgen sicher der große Aufreger im Stadtteil.
The new parking fees are sure to be the big hot topic in the neighborhood tomorrow.
Der Skandal begann, als die Zeitung über geheime Zahlungen berichtete.
The scandal began when the newspaper reported on secret payments.