What’s your hyperfixation?

What is something that you tend to hyperfixate on when hypomanic/manic? Is there a theme or is it random?

I’ll go first: I fixate and obsess on a specific person, such as a musician or actor (sometimes I am familiar with them and sometimes I’m not) and it’s all I can do for days, sometimes a week or more. It feeds into a delusion I then have that they know who I am and watch how I behave throughout the day, validating a grandiose thought that I’m amazing and cool enough. Lol.