I am in fact a SAHM
. We live in a university town and every Wednesday my DM has the baby for the morning so I get a break. About a month ago I ordered a book from waterstones and picked it up from the university branch. I'd never been on the campus before and couldn't believe there was no security or need to show any student ID. After i'd been to Waterstones I got a cup of coffee at one of the cafes and had a wander round the grounds.
Its lovely there, lots of (cheap) restaurants and cafeterias and you don't need to show ID to use them 
The next week I went there for lunch and looked around the library for a few hours.
Today I was wandering around and sat on the bench outside the lecture hall. There were hundreds of students milling around and the lecture schedule on a big flat screen TV on the outside wall. Anyway i watched them going in to each room and there were loads of spaces in the halls (big double doors open so i could see in). Then I was looking at the schedule and there were lots of interesting sounding lectures on. It suddenly occurred to me that i could probably just go in and sit in on one without being noticed by anyone. There were quite a few mature students so I don't think i'd stick out too much.
Now i'm home I think I might be being a bit mental (and possibly a bit post natal) to consider essentially stealing lectures I haven't paid for. I haven't told DH or DM i've been hanging around the uni 
AIBU (or do you think I could get away with it)
BTW, can't believe the username Lecture wasn't taken!