Why do Grand Am owners think their car is fast?

i remember 2 years ago this guy in a grand am saw i was driving relativley fast and decided that i wanted to race i guess because at the next light he pulled next to me and put the hammer down when the light turned. he got ahead casue i didnt know he wanted to race so i mashed it and pulled a head when he had about a half a cars length on me. then he asked me what i had done and i said ummm its stock besided the exhaust, his face was priceless.