Oh, coffee and all forms of alcohol.
I think I might have stronger perception of bitter flavours than the average person, so both of these taste bad to me. Coffee is hands down the worst though. It doesn't even smell good. It's like if someone burnt something. Rancid.
Before anyone claims I've just encountered bad coffee - I live in Melbourne, we have a lot of high quality baristas here so I doubt it.
Sadly it doesn't! I'll give up my share. You can have it ๐