Why can't we start thread twice? (Funny)(linkedin.com)

https://www.linkedin.com/groups/whats-reason-behind-we-cant-70526.S.5876566413342171137?view=&item=5876566413342171137&type=member&gid=70526&trk=eml-b2_anet_digest-null-8-null&fromEmail=fromEmail&ut=1EvCPKyAjSlmg1