Although, I have a feeling you might happen to see the shirt on him after Hallow's Eve. It was a quick project and requires one of my very favorite craft supplies: Project Paint made by Simply Spray. The Project Paint works well for this shirt design because its thicker and won't bleed like the regular spray fabric paint (yes, I know this shirt bleeding has a heart on it, but if the paint runs, you'll have a blob instead of a heart). You can also use the Spray Blood, but not if you plan to wash and keep the shirt after Halloween. I've seen Simply Spray paint for sale at Michaels and Jo Ann Fabrics.
You will need:
red Simply Spray Project Paint
a tee shirt
Slide the cardboard between the layers of your shirt (to avoid paint from seeping through to the back). I folded the fabric around and taped it in the back to keep the cotton taunt and in place when I prop it up to spray.
Next, cut a heart shape from your contact paper. I folded the contact paper in half to cut it.
To begin, spray the top portion of the heart with little spurts until its completely coated in paint.
Gently pull up the bottom half of your stencil. you may have to unpeel or cut some of the surrounding tape and contact paper.
Holding the stencil up with one hand, use the other to spray the bottom portion of the heart. Allow the paint to drip and run down the shirt. If you'd like more drips, use a toothpick to drag the paint down in streams.
When you are happy with your bleeding heart, blot the heart with paper towel to absorb extra paint and slowly remove your stencil.