At 16 minutes in Last Crusade, when the students are swarming outside Indy's office, look at their notebooks. Most of them have white stickers that say "Barnett" in big letters. I'd offer a screen capture, but I'm not sure how to take one on this computer.
16:01 - there's a great shot of one in the lower left corner of the screen, then as the camera moves back you can see it again in the center.
Now, Sankara, please don't reply back with "They're the same college!" unless you can offer some sort of evidence to support your claims.