I'm fortunate enough to be a member of several communities which enjoy pranks, shenanigans, gags, and other mischievous hijinks. Many of these activities are carried out anonymously, and I'm sometimes asked if I am involved or know who is. However, I believe that discovering who is behind an anonymous shenanigan does not enhance the fun.
Thus, my policy is to neither confirm nor deny involvement in any given anonymously-perpetrated shenanigan, nor share any knowledge I might have of the the perpetrators' identity, regardless of my own actual involvement or knowledge and regardless of the evidence which the asker has otherwise obtained (correct or not).
And yes, I may or may not have some things cooking. :)