“When you are coming in from the bullpen, it is important to ‘announce your presence with authority,’ as ‘Nuke’ LaLoosh famously put it in Bull Durham.
“Can you imagine?! A monster truck! Climbing in that thing from the bullpen and driving it onto the field, maybe doing some donuts on the infield or some sick jumps off the mound before dropping me off to pitch?”
The above quotes come from a 2015 Player’s Tribune piece written by Sean Doolittle, titled “9 Things I’d Like to Ride to the Mound.”
Doolittle mentions everything from Heelys to hoverboards to Luckdragons in the aforementioned piece — but oddly, not a bullpen cart.