From there on out, everything he does makes perfect sense: stay cool, stay away from the girls, and amuse the other kids who, like you, were also pulled into this by the lure of free pizza. Poke holes in your napkins and wear them as masks, pig out, stretch your pizza cheese, hang a spoon on your nose, construct a straw aqueduct around the table, become the life of the party, and if your antics win you a certain little admirer, wipe her kisses clean off when you get back out to the car! All in all, a day well spent, a problem averted, and even your mom is none the wiser. "Yuchchk!!"
I'm lucky to still have the old VHS, so I can see this thing the same way I grew up seeing it (yes, I actually still have a working VCR).