I forgot to drop off Theo
After dropping the Cosbys at the pool, you had to go back and finish the job because you're a forgetful idiot.
I forgot Theo at the pool and had to go back and drop him off because I’m a forgetful mess.
Left Theo at the pool and had to go back and drop him off like it was a chore.
I had to go back to drop off Theo because I forgot him like I forgot my brain.