The charge of drunkenness was leveled against the apostles on Pentecost day because

The charge of drunkenness was leveled against the apostles on Pentecost day because they spoke in other tongues. The apostles were gathered together in a room when suddenly a sound like the blowing of a violent wind came from heaven and filled the whole house where they were sitting. They were filled with the Holy Spirit and began to speak in other tongues as the Spirit enabled them. Some of the people who witnessed this event thought that the apostles were drunk, as they had never seen anything like this before. However, Peter explained to the crowd that the apostles were not drunk, but rather filled with the Holy Spirit as prophesied by the prophet Joel.