"Stairway to Heaven"

A brunette, a redhead, and a blonde were on their way
to Heaven. St Peter told them that the stairway to Heaven
was 1,000 steps, and that on every 5th step he would tell
them a joke.

He told them not to laugh at any of the jokes along the
way or else they would not be able to enter Heaven.

The brunette went first and started laughing on the 45th
step, so she could not enter Heaven.

The redhead went next and started laughing on the 100th
step, so she could not enter Heaven either.

Then, it was the blonde's turn. Step 5 joke had no impact;
she didn't even crack a smile. The same with step 10,
step 15, and 20, all the way up to step 750.

On step 755 she grinned a little, but quickly got under
control.

All was well until she got to the 999th step.

All of a sudden she started laughing, uncontrollably.

"Why are you laughing?" St. Peter asked. "I didn't even tell
a joke."

"I know, I know," the blonde replied. "But I just got that
first joke!"