Back in the late 90's, My roommate took down a neighboring universities network for a few hours over a dispute on a bulletin board. He was a TA for the engineer

Back in the late 90's, My roommate took down a neighboring universities network for a few hours over a dispute on a bulletin board. He was a TA for the engineering department and simply walked into the library, told the person behind the counter he was a TA and needed two professors email and password credentials. He then used those credentials to hack into the neighboring universities network (not very hard either - apparently a simple dictionary attack got him in as a root user) and start wreaking havoc under these professors names. Yes for sure different times. Still laugh about how easy it was for him to get credentials which gave him a sort of 'super user' privilege's on our own network just by having professor credentials.