Tape an easy to read sign to the back of your chair that reads: NO, I'M NOT HAVING FUN YET. That should quiet them down. I had the same problem with a stupid joke where I work years ago. If you said a phrase that could inferred to fit the joke, they would say, "That's what she said last night." Examples: "I've got a headache." "That's what she said last night." "Do you have a larger one?" "That's what she said last night." You get the idea. Morons with no real sense of humor thought this was hilarious. I brought it all to a screeching halt by using it when it would make no sense at all. "Have you seen the paper?" "That's what she said last night." "My car wouldn't start this morning." "That's what she said last night." After a few days of this, I never heard it again. :^) Just make it unfunny for them. "Having fun yet?" "No." (Say it very flatly, without smiling, looking them straight in the eye. Continue looking at them, don't blink until the silence becomes uncomfortable. This should work. Alternately, leave out the "No." to really make them uncomfortable. After they leave, smile to yourself. NOW you're having fun. :^) )

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy