A rabbit goes into a bar on a Monday and asks for a cheese and leek toastie. He takes his meal over to a corner and begins nibbling. He enjoys his snack so much that on Tuesday the rabbit returns for another cheese and leek toastie and then again on Wednesday. On Thursday, feeling a little more adventurous the rabbit comes in and opts for a cheese and tomato toastie. The rabbit isn't seen for the next two days until, on Sunday, he crawls into the bar looking very pale and thin with gooey red eyes.

"What happened to you?" the barman asks, "You look terrible!"
"Oh it's been a horrible couple of days." The Rabbit moans. "I've been so unwell!"
"Oh no!" The barman says, concerned, "Have you seen a doctor?"
"Yes." The rabbit croaks feebly, "He says I've been mixing mi' toasties!"

Aha! Mixinmitoasties! Err, myxomatosis? Oh nevermind... *wanders off sullenly*