Grant Gustin

Grant Gustin -- the guy who plays "The Flash" on the hit CW series -- wasn't so quick on his feet when he needed to find a way to relax while on a flight to Canada ... 'cause his plan went up in smoke. We're told Grant was aboard Compass Airlines Flight 6006 Sunday night from LAX to Vancouver,…

Watch your back around "The Flash" star Grant Gustin ... from the looks of things, he's the class fast clown on set. Gustin broke his boredom during a shoot in Vancouver by busting out the ole bunny ears ... at a security guard's expense. Sure, he could have been flashing (yeah, we know) the peace…