I don't really lie, but the biggest one...
When I told my Mom that I was going to a friend's house, which was on my littlest sister's birthday. I said I was going over to work on a project because during that month, we were working on a film for Japanese. I wasn't scheduled to go work on it that day, though. What really was happening was that my boyfriend was taking me to Planned Parenthood so I could confirm my pregnancy.
Consequences? Well, I got yelled at after I told her the news because she was upset that I hid it from her and lied about where I was going. That's really as far as it went. She was easy on me because she knew I was afraid and that same day I told her I was probably miscarrying.
But really, I can't think of anything bigger than that. o.o