hi, i was wondering what simpsons episode this was, as i forgot

Homer and Bart go to these booths( which look like tanning booths) and go on adventures, and homers booth gets hit by a lorry.


Thats all i remember, if you know which episode it is then let me know

Thanks.

does no one know it?

I think you're talking about the episode:

Make Room for Lisa (aired 2/28/1999)

Where Lisa and Homer both use sensory deprivation tanks.

Here's the synopsis:

Homer gets drunk and when he returns home, he realizes that he has to spend quality time with the kids. Upon Lisa's request, he brings them to a Smithsonian exhibit, sponsored by Omnitouch. While there, Homer ruins the Bill of Rights and he winds up owing Omnitouch $10,000. Since the company wants to put a cell site in his area of Springfield, Homer lets them build the antenna tower in his yard and the equipment to run it in Lisa's room. Lisa now has to share a room with Bart. Lisa is driven crazy by Bart and she has no place to do her homework. She begins to have stomach problems due to the stress. She wants to go to a new age shop to find a cure. Homer brings her there and they both sit in sensory deprivation tanks for a couple hours. Lisa hallucinates like she is supposed to, but Homer is just bored. Repo men come to take one of the tanks, taking Homer on a wild ride in the back of a truck. Lisa begins to realize that it is often her fault that she and Homer are drifting apart. In the end when they are together again, Homer and Lisa go to a demolition derby together.

I think I thought that one, too.

cheers mate, ive been looking for the name of this episode for ages.