Gone engi just in time to figure out all the good sentry spots are taken?
The only spot you can drop going to get you turned into small bloody chunks as soon as the enemies look your way?
Try these "unorthdox" ways to muck about before you catch the death-train back to spawn!
(Satisfaction not guaranteed.)

1) Get a tele up.
2) Drop a dispenser in a postion on the next cap (to quickly set up a gun later) or somewhere close to the first (for easy resupply).
3) Drop "suicide guns" (level 1s that you don't even try to man, just hope attract enough attention from the ubers).
4) Man the guns of your fallen comrades
5) Spy check
6) Draw fire
7) Take over any good sentry spot that gets vacated