Odd or mismatched software and hardware. An alien might not understand the hierarchical filing system, so she might put all her files and applications in the same folder. Aliens can also exhibit paranoia, so an alien may worry that if he throws out one document, all other documents will disappear. Perhaps this occurs in different solar systems. Bizarre sense of humor.
Aliens often exhibit inappropriate senses of humor.
For instance, an alien may burst out laughing in the middle of a serious discussion about the difference between clicking and dragging. Puts you on hold frequently. Aliens have trouble with human language and often must put you on hold to consult references in order to figure out what you are saying. Keeps a written or recorded diary. Aliens worry that they won't retain every subtlety of the conversation and feel more comfortable recording it.