Mixed metaphors, again!

Filipinos make mistakes mixing metaphors.
So do Americans!
Can you spot the errors?

English professors love to catch the errors students make
in their term papers, and they love nothing better than
to catch mixed metaphors. The “friends and survivors” of
Calvin College English department collected this list of
mixed metaphors and posted them on their web site:

“He swept the rug under the carpet.”
“She’s burning the midnight oil at both ends.”
“It was so cold last night I had to throw another blanket
on the fire.”
“It’s time to step up to the plate and cut the mustard.”
“She’s robbing Peter to pay the piper.”
“He’s up a tree without a paddle.”
“Beware my friend…you are skating on hot water.”
“Keep your ear to the grindstone.”
“Sometimes you’ve gotta stick your neck out on a limb.”
“Some people sail through life on a bed of roses like a
knife slicing through butter.”

–From ‘Clean Laffs”: