Most trash cans say “push” on the lid (if anything at all), and at fast food restaurants it’s often “thank you”.
This one in the Dat Backhus bakery near Hoheluftbrücke says “kick”. Haha!
Speaking of Hoheluftbrücke, I really like the way the umlaut is inside the letter in this sign, instead of over the letter. It’s a pretty retro design.