I tried not to write one-word unfinished sentences too often, as it felt too easy. Sometimes, though, my shortest unfinished sentences yielded some of the most diverse results. Here's an example from August 1989:
Supposedly...
...all the classes we have to take will help us later in life. (Sajid A.)
...it only rains below the clouds. (Lori B.)
...roses capture the essence of femininity. (Sarah G.)
...it is possible to take the genes from a lightning bug, mutate them with a tobacco plant, and get a glow-in-the-dark cigar. (Mark Z.)