I alway got a kick out of it. Especially when I was writing a big fat zero on the paper and writing the reason for the grade, citing the other’s paper (it got a zero, too).

That's true. Always funny when they copy each other and the thing they're copying is wrong 

SimpleStacker

Yep, that looks like what students have done since time immemorial. If they use each other’s work, they don’t bother changing anything but the name on the paper!