I got this in treasure trails:

 

Blow a raspberry at the monkey cage in Ardougne Zoo. Equip a studded leather body, bronze platelegs, and a normal staff with no orb. Studded leather body, Bronze platelegs, Staff (can buy in Varrock shop or Mage Guild) Facing the monkey cage in Ardougne Zoo.

 

 

 

So, I have Studded Body, Bronze Platelegs and a plain staff, standing in front of the cage blowing rasberries and nothing happens. What is the deal?

Are you sure the "plain" staff you're using isn't something like a Dramen Staff instead of a normal staff? And have you tried doing the emote facing the cage from different directions with respect to the cage?

Oh, lol. Silly me.

 

 

 

Thanks!