Mouth Going Numb

Hi, I had a few Heinekens at an event tonight with a paid bar. 4/5 drinks tasted normal. 1 tasted very weird and made my lips and tongue go numb. This also happened when my friend tried it. She was not drinking Heinekens at the time. I asked for a new drink and it did not happen. There were no other symptoms and our mouths felt back to normal after 30-45 min. My first thought is a type of disinfectant. My friend is worried about a drug. This definitely makes me worried. Any thoughts?