Not hard to gain access to admin accounts, either... My last year of high school, they got a full Mac setup going for their then-new TV production courses. I happened to have that class but every computer was so locked down that they were all but useless for anything other than iMovie or web browsing, despite being loaded with the Adobe Creative Suite.
I opened up the terminal at startup and ran through the initial system setup program again, granting myself full access to everything. Took about 5 minutes