What you'd get is this output:
```
CRITICAL - shit; bad; crap
WARNING - hmm; might be bad; not ideal
```
And what nagios does is that it just takes the first line. This in the same way that
```
CRITICAL - shit
bad
crap
``` 
...just became "CRITICAL - shit"

Does that make sense?
Basically, we only get 1 line to send to Nagios. And as it stands now it will only send the critical problems all into one line.