1. They Dont Know How To Dress
For some reason, the future is filled with people who either a) buy clothes in sex shops or b) fetch clothes from the trash. Time travelers often seem aware of this tragic fashion faux pas, and regularly opt to hop trough time in their birthday suit you know, to avoid embarrassment. Or in the most unfortunate of circumstances, come in their outlandish future get-up. The tragic off set of this is that because future fashion is so, frankly, crap, it means that time travellers have literally no idea how to dress themselves in the modern day/past/future. Time travel is normally a result of emergency causes or accidental breakthroughs, so leapers are generally not in much of a mood to go window-shopping. The resulting look is something between Hobo-couture and Costume clown. A valuable lesson to be learnt from this is always travel through time with a mirror and a good pair of shoes. No matter who you are, you can travel thousands of years into the past and still not be able to find some suitable footwear. Most likely to say: I need some clothes.
CASE STUDIES: 12 Monkeys, Austin Powers