World of Warcraft for quite some time, I think about 4 years, had a "mysterious" limit for the maximum amount of gold that you could accumulate on a single character. It was 214.748 gold, 36 silver and 47 copper...

At least they put an actual check in there - you didn't suddenly overrun and wake up with an enormous debt, so I'll give them some credit for that ;-)

IP4 address space comes to mind.

And I think it isn't uncommon to have to add digits to the front of telephone numbers as regions grow (or telephones become more common) and the number space isn't large enough.

IIRC at least slashdot and twitter had to do some non trivial database migrations because they hit maximum value of some ID field.

A particularly expensive example: https://en.m.wikipedia.org/wiki/Cluster_(spacecraft)#Launch_...

Microsoft Lync has an as-yet unfixed bug where after 49.7103 days (4294967294 aka 2^32 milliseconds) of system uptime, it locks the Lync status indicator to "away". The status indicator is otherwise unusable thereafter until a full system reboot.

See: https://social.technet.microsoft.com/Forums/en-US/1e76e106-4...

I mentioned in in another commend but Pacman crashes at level 256

http://pacman.wikia.com/wiki/Map_256_Glitch

A counter overflow factored in the THERAC-25's race condition (one of the software's interlock was an overflowable counter rather than a flag, if the operator started treatment right as the counter overflowed the system would proceed rather than refuse).

IIRC the whole "Gandhi is gonna nuke the rest of the world" meme came from such a bug occuring in the world-domination strategy game Civilization 2.

Plenty, Twitter for example.

Well, famously youtube's views counter overflow from Gangnam Style...