50 ISTPs in the same room...
Would start with the bare minimum of chit-chat... let the others know you're there.
Then we would go our separate ways. 50 different projects, adventures, or similar.
Eventually someone would fuck up and someone else would have to save their ass from getting hurt or killed.
Then everything would go back to normal, until something else exciting happens. If I knew they were all ISTPs, I'd probably eventually get curious about what the others were doing.