1. We laugh together and go out.
2. We laugh together and go out at the same time.
3. We laugh together and then go out.
[There are two actions. Do the two actions happen at the same time? Or after the first action ends, does the second action begin? The first action is to laugh together, and the second action is to go out. Is #3 different from #1? Does #1 mean #2?]
1 could mean the same as either 2 or 3.
2 states simultaneous actions.
3 states separate actions.