"Big Guy and Little Guy" joke

There was this little guy sitting in a bar, drinking,
minding his own business when all of a sudden this
great big dude comes in and -WHACK!!- he knocks
him off the bar stool and says,
"
That was a karate chop from Korea."
The little guy thinks "
GEEZ"
but he gets back up on
the stool and starts drinking again when all of a sudden
-WHACK- the big dude knocks him down AGAIN and
says,
"
That was a judo chop from Japan."
So the little guy has had enough of this so he leaves
and is gone for an hour or so and when he comes back
-WHACK!!!"
- He knocks the big dude off his stool
and out cold!!!
The little guy looks at the bartender and says,
"
When he comes to, tell him that was a crowbar from Sears.