What's the best malapropism you've ever heard?

Question

Some personal favourites/hatreds:

- "effluent" instead of "affluent"

- "antidote" instead of "anecdote"

Answer 1

My favorite is one that Joey said on Friends -

"No, a moo point. Yeah, it's like a cow's opinion. It just doesn't matter. It's moo."  

One of my pet peeves is "for all intensive purposes" instead of  "intents and purposes"

Also "statue of limitations"  instead of "statute of limitations"

Answer 2

using "then" in place of "than"  

"form" in place of "from" - brought about by the rise of spell-checking software without grammar checking.

"there" in place of "their" or "they're"