I wouldn't get too up tight over it if I were you.
They may have been laughing at something totally unreleated......even though they may look at you, then start laughing, who's to say it didn't remind them of a funny situation that you are not even part of and they are simply having a giggle over.
And if it was about you, who cares, smile and giggle back at them!
No big deal really.
RaverFlaver
