Okay, so I was looking around allkpop and I saw this article:

MBLAQ'S Seungho accidentally goes into SHINee's van

I went and check the article right away...here's what it said:
 

On November 20th, k-pop fans in Taiwan got to see SHINee, SISTAR, MBLAQ, and ZE:A perform live at the ‘K-Friends 2011 Taipei Fireworks Concert‘ held at the Banqiao Gymnasium in Taipei. On top of the thrill of watching these top idols sing and dance right before their eyes, some lucky attendees who followed the artists afterwards caught a hilarious mishap that occurred between a few members of MBLAQ and SHINee.

Apparently, during MBLAQ’s departure from the venue, the members waited on the curbside for their transportation to arrive. As a van pulled up, a staff member and leader Seungho pulled open the door. The poor singer made a move to get into the van… only to be greeted by blank stares from SHINee’sJonghyun and Key, who were sitting inside. Oh, the awkward.

Watch a brief fancam catching the split second mishap below! 

http://www.youtube.com/watch?feature=player_embedded&v=ah7zrzZ2FKk

I loved their expressions <3                                                               

Credit - allkpop.com