A coworker is constantly taking credit for your ideas and accomplishments- undermining your contributions and making you feel invisible.
Start taking credit for increasingly outlandish and impossible accomplishments- like inventing a perpetual motion machine or communicating with dolphins through interpretive dance.
Create a fictional alter ego who is a brilliant but eccentric genius- subtly implying that this alter ego is the true source of your ideas.
Document your contributions meticulously- creating a detailed log of your work and sharing it with your supervisor and colleagues. Include humorous anecdotes and witty observations.
If confronted directly- feign confusion and 'accidentally' confess to stealing your coworker's ideas- apologizing profusely while subtly highlighting their lack of originality.
Organize a mock award ceremony- presenting your coworker with a 'Stolen Idea of the Year' award- complete with a humorous acceptance speech and a trophy made of recycled materials.
Credit snatched away-Shadows grow- work unseen- unheard-Laughter finds the light.