http://www.smbc-comics.com/comic/best-3
Alt text
The only possible problem is if being crushed in a universe-ending sea of flesh would make it no longer be the best day ever.
Bonus panel
http://www.smbc-comics.com/comic/best-3
The only possible problem is if being crushed in a universe-ending sea of flesh would make it no longer be the best day ever.
I think it still works. If you increase the number of humans by 6 orders of magnitude, it still seems unlikely to form a black hole big enough to be an issue
Humans? How arrogant of you (<3) to assume that only humans exist and only they have access to time travel.
Add aliens (and artificial lifeforms) to the mix and watch the universe implode!
Plus the mass of time travel devices.