I almost lost my SH?! at a campus reseller and Apple reseller too, once.
I had purchased a PowerBook, then bought some RAM.
I wanted to install it at uni and did not have a (standard) screwdriver handy. I asked the store/s whether they had performed upgrades e.g. RAM and they said yes, meaning they had a screwdriver on hand.
They would not let me borrow it though, to install RAM into my machine (since I was not a customer and did not purchase the RAM from them).
It was just a screwdriver. For 2 minutes.
In the end they told me to go to Tandy/DSE to buy a set, so I just went down to my Faculty and they let me borrow an entire screwdriver kit no questions asked. Gotta love Engineering labs.
My similar story to the comic.