Nothing wrong with a harmless mild joke once in a while, but sometimes it can go a little to far.  Remember, what might be funny to one person might not be too funny to someone else.

A great way to pass the time or get fired. Suspending things in Jello is really fun but takes some time. I learned that from The Office.

When I worked at a grocery store we duped this kid into eating a habenero pepper, one of the hottest peppers in circulation. He turned visibly red and made the mistake of pounding water after he ate the fool thing.

The secretary in our office is notoriously clutzy. One day she fell flat on her face right in the middle office. No obstacles, just tripped and fell over. The next day our boss had put masking tape in the shape of a body on the floor where she had fallen. Still makes me laugh.