Back in the day it was trendy to affix the year you signed up for an account to your account name - rather than the birth year. It was interesting to see things like sandra96@yahoo.com still the primary email address when sending someone an email to catch up post uni.
God help me, I cannot stop myself from laughing every time I see a @yahoo or @aol e-mail address on job applications/resumes.
Bonus laughter if it's something massively inappropriate. Some e-mail stems from the last position search (this is at a college, granted it is an entry level position, but it's still a college): cuntcrasher, c00rslight, bigswag420, trideltaFcups, and my personal favorite, milfhunter9inch.
These are supposed to be professional people. This is real life. This is real. I can't wake up.
I'd be interested to know what percentage of 21 year olds know what yahoo is (they would have sold Tumblr right around them being 18 years old).