I first saw a Matt Groening cartoon in the early 80s, well before 'The Simpsons'. The next door office had 'The Nine Types of Bosses' from the 'Work is Hell' series on the wall.
As for tat, I used to go to DAVIC workshops in the mid 90's. The process was putting together standards for digital media distribution - streaming & broadcast. One of them was held at the Beverly Hilton in LA to try to get Hollywood interested in what we were doing, and it was the one & only time we all got a goody bag of tat. One was a T-shirt from Apple with 'Windows 95 is Macintosh 89' on the front. I wore that for years. Another was a frisbee from Novell with 'The Billion Node Network' on it. Laughable in hindsight but I seem to remember it was a bit of a joke even then.