Mrs. Bunny and Mr. Bunny were having a morning hop in the woods when Mrs. Bunny began screaming incoherently and hopping up and down in place, waving her arms about and making snorting noises.  This was unusual behavior even for Mrs. Bunny.  When she had calmed down somewhat Mr. Bunny asked her what the matter was and Mrs. Bunny announced that a bug had flown up her nose.   She was unable to get it out.
"That is unfortunate,"  said Mr. Bunny.  "For everyone knows that a bug that successfully makes it past the snorting attempts to expel it, and carries on upwards, eventually makes it to its desired destination, the frontal lobes.  And then it eats your brain."
Mrs. Bunny looked at him with horror.  She knew he was only having his little joke but such a thought had occurred to her more than once on similar occasions.  The fact that her brain seemed to have survived several such bug journeys was no comfort.  It was her private contention that in each case the bug had entered through the nose but exited through her long and fuzzy ears, bypassing the brain completely.
No more of this was said for Mr. Bunny was intent on telling Mrs. Bunny every tedious detail of his last shopping trip and the bargains thereof and seemed to have forgotten the bug.  Mrs. Bunny was not so fortunate.
That evening, however, at Jeopardy, Mrs. Bunny declared Spain to be the capitol of Chile and Eisenhower to be the fourth president.
"Ah,"  said Mr. Bunny, "the bug has begun to munch.  I guess I should say good by to the Mrs. Bunny I used to know and love."
Ha ha ha.
Mrs. Bunny spent the night with her furry paws clutching her head.  Just in case it helped.
Mr. Bunny spent the night on the couch.
In the morning Mrs. Bunny found a squished bug on her pillow.  She ran to get Mr. Bunny.
"Look!" she cried, pointing to it.
"Ick,"  said Mr. Bunny.  "Change the pillowcase."
"You are missing the point!"  said Mrs. Bunny impatiently.  "The bug made his way back out."
"How did he do that?"  asked Mr. Bunny.
"Perhaps through my ear,"  said Mrs. Bunny.
"Mrs. Bunny,"  said Mr. Bunny,  "I really don't want to hear about bugs for at least a fortnight.  A joke is a joke but now I really AM beginning to worry about your frontal lobes."
"Ha!"  said Mrs. Bunny.  "The evidence is undeniable."
Mr. Bunny just shook his head and proceeded with his day.
That night at Jeopardy Mrs. Bunny skunked Mr. Bunny.
She rests her case.