My friend and I have hand motions we use to bail each other out of situations, which includes a parachute rip cord motion and flapping your hands above your head like an idiot motion. Or you can pull a Jenna Marbles.
Otherwise, I agree with the majority in telling staff or security.
***FACEBOOK COSPLAY PAGE COMING SOON***
Modeling FB Page
Acen 2013 cosplays:
-Lilith from Borderlands 2: 30%
-Talim from Soul Calibur 4: 40%
-Police Stocking from PSWG: DONE ALREADY HOLLA