On 6 Apr 1995, deborah wisti-peterson wrote:
> the coolest trick (which none of you have mentioned yet!) is to
> take a small chip of dry ice and put it into an eppendorf tube
> and close the lid securely (WARNING: do this in the sink or you
> will put someone's eye out!).
>> this is especially amusing when you can slip it into a closed
> drawer without being noticed.
>Ok, ok, you've got me into the fray: another favorite of mine is to pour
a container of liquid nitrogen under the door of the office of someone
is working studiously inside. Only works for non carpeted floors and has a
greater impact on the uninitiated ;'>