There were so many aliens in the crowd, tall skinny ones with green spiky skin, short, plump ones with polka dot skin, even big orange squishy blobs, Donna could tell she was the only human on this planet, the only one in this busy alien shopping centre.
The Doctor had wandered off somewhere between Donna trying on clothes and buying souvenirs, he had gotten bored, and didn't tell her where he was off to. Of all the times he reminded her not to wander off, he did exactly the same thing.
'The hypocrite' Donna thought to herself, as she pushed her way through the crowds of alien shoppers, trying to find some kind of sign of the Time Lord.
After about half an hour, she saw the spiky hair and the long coat of the Doctor standing in a technology shop, his body bent over some kind of phone, he was chatting animatedly to the sales man about the features, Donna sighed in relief. She wandered over, and cleared her throat.
'Thank goodness, you are a long streak of nothing Doctor, you are so easy to spot in a crowd, did anyone ever tell you that you are so tall?" He whipped around.
'Donna! There you are, look at what I found.. it's a new smart phone, and this phone has the ability to video call, I love video calls, we can see and talk together at the same time, even if we aren't in the same place, how brilliant.. what was that for!' Donna had just slapped him on the arm.
'Don't wander off!' she reminded him, with a scowl on her face.