That explains it

There is a factory in Northern Minnesota which makes the Tickle Me Elmo
toy. The toy laughs when you tickle it under the arms.

Well, Lena a blonde is hired at The Tickle Me Elmo factory and she reports
for her first day promptly at 8:00 AM.

The next day at 8:45 AM there is a knock at the Personnel Manager's door.
The Foreman throws open the door and begins to rant about the new employee.

He complains that she is incredibly slow and the whole line is backing
up, putting the entire production line behind schedule. The Personnel
Manager decides he should see this for himself, so the 2 men march down to
the factory floor.

When they get there the line is so backed up that there are Tickle Me
Elmo's all over the factory floor and they're really beginning to pile up.
At the end of the line stands Lena surrounded by mountains of Tickle Me
Elmo's. She has a roll of plush red fabric and a huge bag of small marbles.

The 2 men watch in amazement as she cuts a little piece of fabric, wraps
it around two marbles and begins to carefully sew the little package
between Elmo's legs. The Personnel Manager bursts into laughter.

After several minutes of hysterics he pulls himself together and
approaches Lena.

"I'm sorry," he says to her, barely able to keep a straight face, "but I
think you misunderstood the instructions I gave you yesterday . . .your job
is to give Elmo two test tickles."