Dear Dr. So-and-So,
I honestly tried to care about this week's tute work, but it proved beyond me. This is, perhaps, unsurprising, given that it constitutes the dullest, most complex and least relevant part of the dullest, most complex and least relevant paper that I will be sitting next term. I hope this note will do in lieu of the work set - after all, we both know, and have come to accept, that I genuinely don't give a flying **** about your subject.
Best wishes etc.
Do you think I'll get away with it? So tempted...