I found the story told in a book review of The Lost Blogs by “samzenpus” on Slashdot so funny I had to excerpt it here:
I used to work at a restaurant in college. After I was there for a year it was my job to help train new employees. One evening they had me train a nice young girl on the dessert station. The dessert station was one of the easiest places to work all you did was bake and slice pies and make the occasional ice cream sundae. An order for a hot fudge sundae came through the ticket machine so I got out a bowl and got her started. We used hot fudge packets that had to be warmed up in the microwave before being squeezed out onto the top of the ice cream. I told my new young trainee that the hot fudge needed a thirty second bath of microwaves and to get me when it was done and I’d show her how to pipe on the whip cream all fancy like. After a few minutes she came up to me and said that the ice cream had all melted, so she tried it a second time with the same melting results. I looked over both bowls of liquid ice cream and asked her how they melted so fast? I asked her to make another one while I watched to see what she was doing wrong. She scooped out the ice cream, opened up a packet of fudge squeezed it out and put the whole bowl into the microwave. I didn’t know what to say. She microwaved ice cream six times that night while I watched, not once did it occur to her that ice cream would melt in a microwave. I comped the mans bill for the sundae he never got and had a good portion of the restaurant employees gathered to see if the trainee would ever solve the melting mystery. She never did and until I opened the first page of The Lost Blogs the six sundaes in the microwave was the stupidest thing I have ever seen.
The rest of the review is also funny, and equally harsh.