I know you sometimes gotta do what you gotta do. But word of reneging will get around and it could come back to bite you some day.

I likely wouldn't unless the company was really being unreasonable and wouldn't budge (and that should probably give you second thoughts) and you have another hot lead that you'd really prefer if it came through.

I agree I wouldn’t do this. I wouldn’t actually feel bad doing this if my offer were exploding but I would worry about burning bridges. Most of the people I know who were doing this were new grads