As a Champaign resident, this doesn't exactly shock me. This is a college town, and most of the people working at places like Drew's (which is a locally-owned business, not a chain, and is right smack dab in the middle of campustown, so it caters largely to the campus community) are college students. College students occasionally do stupid things. From what I've read in the local paper, this is something the night shift came up with... not the owners.
But that aside, there are far better pizza joints around here. Papa Del's is 100 times better than Drew's.