If we anal-ise the situation... it might even influence the experiment if one had to use margarine as apposed to butter.... I havent even dwelled on the thought of using lard... Perhaps if one used a larger species of the cat family for example a White Bengal Tiger... and the slice of bread had the crusts cut off... would this interfere with the so called experiment... the possibilities are endless... brown bread, wholegrain... gee's imagine if you had to use french loaf...would the cat yell "CHIOTTE!!!!!!!!" (in a kitty language of course.....) as it were struggling the odds with the bread.
Who knows what fate holds in store for both the cat or the bread....
Lastly but not leastly (is there such a word?) what if the cat happened to be Garfiled... he may eat the bread before he lands???????

I certainly hope this gives you all food for thought (pun most definately intended)

"If toast
always lands butter-side down, and cats always land on their feet, what
happens if you strap toast on the back of a cat and drop it?"

Steven Wright