some days... when you have to take a piss. you just dont make it to the toilet. you know what its like, in times like these. i turn to the TI-89. not only is there a 2.5mm plug for you to let go in. but you can use it as a pencil holder as well! oh! i have to go to the bathroom! <zip> ... ahh.... now folks. you can have this wonder. the TI-89. for only 5 dollars (used).