Tempdb Corruption

For the longest time the guidance around tempdb is that if you shrink it on a live system then it could cause tempdb corruption.

http://www.sqlskills.com/blogs/paul/shrinking-tempdb-longer-prohibited/

http://support.microsoft.com/kb/307487/en-us

Remember though, shrinking should be a rare operation, whether data or log file shrinking – and never a regular operation.

http://kmp.dell.com/services/kedge/application_services/databases/f/601/t/6558.aspx