I left my cheese/raisin/anchovy/pickle sandwich unattended in the school cafeteria for about ten minutes while I changed into my uniform for band practice. When I returned, I found my sandwich smashed and surrounded by the splattered remains of its former contents. I was so mad, I pounded my fists on the table and accidentally spilled my milk into my tuba.

I think Roger, my worst enemy, did this to my sandwich. He eats a chicken sandwich every day, and I want to get my revenge on that cowardly little cannibal. I know that a well-placed blow could spray all of his friends with globs of mayonnaise and oily meat. What's the best way to punch his sandwich so it makes the biggest mess?