I suspect Bobby will appreciate it the most. Smirk will just make some snide remark about a time traveling bike (AN ABSURD CONCEPT BY ANY MEASUREMENT).
I vote interns. You have not done near enough to terrorize them. In fact, the last one I spoke to had said the job "was great fun" and would "definitely come back." Clearly you've let your standards for intern hazing sink.
Are the interns weeping? If not, then that needs to be remedied. Spoil their pathetic little non-desk with your awesome microcar. After that, laugh at them.