I would have to say that the most memorable gift that I have received was a Swiss Army credit card pocket knife. I got it for my 18th birthday from my girlfriend at the time. One of my friends got me a white classic Swiss Army knife for that same birthday.
I still have that credit card pocket knife. The flap to cover the handle of the scissors has gone missing but everything else is there, including the tailors pin. I use it, too. I take it with me when I go fishing, I pluck the hairs that grow on top of the tip of my nose with the tweezers, and that knife will still open a package. I keep it in the bottom drawer of the shelf organizer that’s in the cupboard under the sink. I use it regularly.
The classic Swiss Army knife was taken away from me at airport security. In a rush, as I always was back then, in University, I forgot to pack the knife when heading home at the end of the winter semester. It was flagged when I took out my keys to put in the plastic tray. I’m sure that the security personnel put the knife in his pocket. I often think of buying a new one to replace it but haven’t yet.
I plan on keeping that credit card knife. I loved that girlfriend a lot. I don’t keep the knife for her, though, but because I’ve now had it for my entire adult life. To help me get over her, I put everything from her in a box. Maybe, that knife will one day open it, too.