Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Banksy has denied accusations he is "trolling" members of the public - after thousands have struggled to buy tickets for his new show.

Banksy: Dismaland ticket problems 'not a prank'