I am reading the book, Diary of a Wimpy kid.
What is the meaning of "All i need" in the sentence, "All I need is for some jerk to catch me carrying this book around and get the wrong idea." ?
Usually
all I need
means there is only one thing which is necessary
All I need is a glass of water.
However, in your example
all I need
is a sarcastic remark which actually means the opposite
what I really don't need is for some jerk...
Context is very important to discern the meaning.