I'd send myself an email or text my girlfriend. If I was more worried about it I'd leave myself a note in the place I typically leave myself notes.

Ask for a second to write the name of the book down, that probably wouldn't be rude in context. If I can't do that but I have a pen, write it on my hand. If I had no other choice I would try binding an image of my door shattering as I opened it.

Bind the habit I want to the fridge door, and explicitly practice closing it a few times a day for a while.

Get them to point out the location on my gps, if possible. I never understood directions anyway.

Memorize the outline of my speech. I'd practice giving it a few times, to get used to filling in the holes in order.

If I knew one of the fancy mnemonic methods for numbers, I'd use it. But I don't, so memorizing the number seems more effort than it's worth. I'd write it down in a second place so I didn't accidentally forget to bring it. Maybe on my arm if I thought it was going to get used that much.

I'd wonder if I actually knew where my phone was, flip out, and tear the room apart looking for it. At that point, I might as well just enter the thought (if I even still have it).

Look up some names, faces and facts. Write a small fact-name association sheet for my phone, and do my best to bind names and faces in memory as we meet.

I don't know. I always thought wanting to be a doctor was weird. At my last job interview they would have looked at me funny if I hadn't pulled up google.