The following story is completely true and not exagerated in anyway.
Cable and I had stopped to eat, breaking our cardnal rule of "never eat at the convention." I went to grab some drinks from the vending machine near by. Despite having the proper set up, this vending machine wasn't accepting 5's and also wasn't accepting credit cards. The Dr and I were both in line observing the problems the guy before us was having. So after he walked off, the Dr inserted 3 dollars (yes, they were that expenisve, hence the aforementioned rule) And got his drink. I had two dollars and a 5 and bummed a dollar of the very generious Dr. Well the machine wouldn't take his dollar. On multiple tries. Until finally, the Doctor held his Sonic Screwdriver up to the machine...........and I'm not kidding, It took the dollar.
I immeadiatly grabbed him and said "Take me with you!" he handed me a key to the Tardis. He had a bunch of them. And we took his picture as a gag