have a bee in your bonnet
US /hæv ə bi ɪn jʊər ˈbɑːnɪt/
UK /hæv ə bi ɪn jʊər ˈbɑːnɪt/

1.
einen Fimmel haben, einen Spleen haben
to keep talking about something again and again because you think it is very important
:
•
She really has a bee in her bonnet about recycling.
Sie hat wirklich einen Fimmel für Recycling.
•
He's always got a bee in his bonnet about punctuality.
Er hat immer einen Fimmel für Pünktlichkeit.