I have caught two bullheads up to now, as far as I remember. This is as opposed to bluegills etc, of which I have caught probably hundreds.

My first bullhead was as a kid. My uncle had a stream through his farm, and there was a 8-10 ft waterfall, with a hole at the bottom of it. I must have had a bobber on either a cane pole or a Zebco closed-face reel. And I caught a "yellow-bellied catfish" that I now know was a bullhead of some kind. 

And this past Fall I caught a bullhead on Pohick Bay off the Potomac in VA. I had a grub worm (real, not plastic) from my compost pile, that I was fishing off the bottom. It's not a big bullhead, but that's all I've got so far.

Looking at YouTube, there are places where bullheads are as easy to catch as bluegill. This guy, for example: 

https://www.youtube.com/watch?v=E1Ub5NB2gm4

And I can't find it right now, but I saw a video of a bullhead tournament where a lake was so overrun with bullhead that they had a contest where people weighed in their bullhead catch by the bucket, and dumped them into a huge bin. I hope they did something useful with all that fish in the end.

Anyway, I'd like to find a spot where they are that heavy. It would be fun!