this imagine may have you running from the kills. this is a guy french kissing taco shells. it was on the company's own facebook page monday. it appears to show the employee licking a stack of taco shels. taco bell thinks the shells never reached customers and a full investigation is underway. >> reporter: do you ever wonder what goes on behind closed doors at fast food restaurants? you certainly hope it's not this. a gross picture of an employee at a california taco bell licking a stack of taco shels. it's the latest in fast food employee incidents. this made it on taco bell's facebook page. >> that's disgusting. >> that is who fieg. >> he should be fired right away. >> they're investigating the employees involved. when we learned of the situation we immediately contacted this