A bent dick caused by taking Viagra with no way to take your pants off.
HAHA, john has a crooked niner, what a loser!
Gate travel via wormhole is one way. A person cannot go through the gate, leave it open, and then step back through it. The gate has to be stopped and then restarted from the opposite planet in order to travel back to the other end. The only thing thing that can travel two ways through the gate are radio waves (which the MALP transmits back to Earth).
The wormhole automatically shuts down after 38 minutes