I'm scared my drink was spiked at the cinema?

Okay so i had a fanta frozen thing (like a slush puppy) and put it in the holder that was near the person next to me (who was an irish gypsy and their friends) and they kept being immature and like running in and out of the cinema etc and like one of them got a text about something and said something about something being 'a once in a lifetime oppurtunity' or something :S then they ran out and came back in again and now i'm scared they like put something in my drink! And i had 3D gles on so couldn't really see around me only in front of me. Am i just over reacting?