have a bee in your bonnet

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