9 (voted best new Passover knock-knock joke)

"Knock, knock."
"Who's there?"
"The Angel of Death."

8

Flat rat
all gone.
I miss her.

7

Flat rat
still there.
Only there's less of her now.

6

The poor blind man
begs again at the escalator.
"I haven't seen you in a while!" someone cries.
"I haven't seen you ever," he replies.

5

Get a life,
butter knife.

4

Flat rat in the gutter
smells and tastes like peanut butter.

3

Boston or Sword.
She goes by both.
So, watch your back,
'cause she'll cut you.

2

Hey,
I'm a plant,
not a Planner.
I have more important things to do.

1

LIVE, EARN, PLAY, LEARN
Fire burn, butter churn.
Bow or stern? Can't discern.
Your turn, Boston fern.