As if I have just found a WASP in my chocolate!! @CadburyUK
What are you gonna do about this!?! #nofilter pic.twitter.com/P2Dpeh9t6f
— Jake Keating (@Jakeating_) January 22, 2014
Jake Keating, from Liverpool, tweeted a photo of the bar containing the much-hated insect trapped inside what appears to be a Dairy Milk.
He told @CadburyUK: "As if I have just found a WASP in my chocolate!!! What are you gonna do about this!?!".
The Birmingham-based confectionery company, the second largest in the world, responded saying it was investigating Mr Keating's claim.
It tweeted: "We'd love to reply with a pun, but we want you to know how seriously we're taking this, so we won't."
The photograph became a talking point on Twitter and Cadbury's rushed to reassure concerned customers of the probe.
Cadbury is best known for its Dairy Milk bar, the Creme Egg, Wispa and variety boxes of Roses.