Mr. Funny Upsets Mr. Fussy is the fifth book in the Mr. Men New Library series.
When Mr. Funny drives by Mr. Fussy's house, he distracts him by making funny faces. Mr. Fussy cannot stand this, so he makes a sign to warn Mr. Fussy to honk his car horn. But little did Mr. Fussy know, that Mr. Funny's car horn isn't a car horn. It's a shoe horn that blows raspberries!